| 00:02 | Okay, We're gonna finish up on islands. Not quite sure how long |
|
| 00:06 | out there, but when we I left you with this diagram |
|
| 00:11 | uh, I find a useful diagram think about as you're thinking about the |
|
| 00:17 | really architectural elements, the different parts the barrier system, and also begin |
|
| 00:22 | compare it with some of the other . For, um, Wave dominated |
|
| 00:30 | as, well River. So I'll that for now. But it is |
|
| 00:34 | useful diagram. Think about. And what we've done is we pretty much |
|
| 00:40 | the life out of the offshore to sequence of a pro grading. We |
|
| 00:48 | dominated setting being a barrier island or cling Okay on. We've also mentioned |
|
| 00:55 | fact that when we think about things reservoir modeling, we need to recognize |
|
| 01:03 | these con forms are really important in way in which the physical properties of |
|
| 01:12 | sediments and sedimentary rocks have developed. , there's one last hola seem a |
|
| 01:18 | I want to talk about. And first thing is you can see that |
|
| 01:22 | is a I was see not the drumstick, but it's best I got |
|
| 01:34 | is gonna be in a mixed title are mixed energy. It's clearly not |
|
| 01:43 | dominated. And if we look at cross section through this Ah, what |
|
| 01:47 | see is a transgressive shoreline. I'm . A Siris of, uh, |
|
| 01:56 | surfaces in this one here is, man is to up, so |
|
| 02:02 | there's gonna be this one. Here the most recent transgression, and then |
|
| 02:06 | have a regressive sequence. This is like we've been talking about. |
|
| 02:13 | And you notice here, there's some over fan deposits. So this again |
|
| 02:18 | a pro grading barrier island. There a little bit of a transgression and |
|
| 02:25 | been pro gradation. Okay, They ignoring that there was an earlier one |
|
| 02:29 | down in here. Uh, so is particularly from this package here, |
|
| 02:37 | kind of a darker yellow is the scene package. Now, on top |
|
| 02:43 | it, we're looking at Aeolian deposits then go into the bay. |
|
| 02:50 | Now, on the, uh, again, we can see that |
|
| 03:04 | Okay. And so we're picking up programming four cents, and but I |
|
| 03:09 | you to think about is something relatively history here nonetheless, with the pro |
|
| 03:17 | and transgression. We're getting some variability what arguably is a simple hole of |
|
| 03:25 | barrier, and I want you to go back and think about those Pleistocene |
|
| 03:31 | that we had in the trended and there was a Siris of transgressions, |
|
| 03:38 | over the regressions, transmigration, transgression, little drop in base |
|
| 03:46 | And so this kind of internal variability we saw apply icing eyes really not |
|
| 03:56 | from the internal variability we see in much shorter period of time, which |
|
| 04:01 | be the whole safe. Okay, there's one. Really there's writing good |
|
| 04:06 | , but one of the examples I the best for a A barrier system |
|
| 04:13 | the Friel formation in Texas. And were looking at a legacy mean system |
|
| 04:24 | is kind of like today. That to say, we've got rivers to |
|
| 04:29 | north and revert to the South. in Central Texas, we have a |
|
| 04:34 | grading, largely pro grading system that's to as a barrier slash strand |
|
| 04:39 | and it's a ah, a large of oil, but also that 80% |
|
| 04:47 | along the update margin. So we're look at what it basically a series |
|
| 04:51 | strata graphic traps that are associated with barrier islands. And this is an |
|
| 04:58 | that I particularly like, but it only available as a Bureau of economic |
|
| 05:04 | part of investigation. I don't have digital copy, but it it's a |
|
| 05:09 | a very nice example of how you take apart a barrier and then look |
|
| 05:14 | the components and then from that look the reservoir quality. So this is |
|
| 05:21 | a cross section of the field, like most of these fields, they |
|
| 05:26 | Siris of sand stones that are labeled number. So here's the 41 A |
|
| 05:33 | be talking about that, and there's couple of things to notice with |
|
| 05:37 | First of all, there are back pinch outs into a look good. |
|
| 05:45 | , of course, those are the fans the, uh, flood tidal |
|
| 05:53 | , basically those sand intrusions into the . In addition, on the marine |
|
| 06:00 | , we see a Siris of regressive that air pinching out seaward, and |
|
| 06:13 | see these regressive packages, or para that are largely vertically accreting Now. |
|
| 06:20 | , there's transgressions regressions, but the of vertical. A creation is making |
|
| 06:28 | barriers stacked one on top of it . Okay, Eso We're gonna look |
|
| 06:33 | one of these. We're gonna look the 41 a and look at the |
|
| 06:37 | Apax, and this is the oil contact here. Oh, and what |
|
| 06:42 | you see? Recognizing that that, , ice impacts are kind of art |
|
| 06:50 | . They you kind of see what want to see. But what I |
|
| 06:56 | in the person I think that drew up is that on this area here |
|
| 06:59 | see a series of more or less oriented, uh, ice Apax. |
|
| 07:06 | then we go into an area here is more or less dip oriented, |
|
| 07:13 | then we come back over here, get a strike Lorena system, and |
|
| 07:18 | it looks like we have something fanning . Okay, so that's the first |
|
| 07:24 | that kind of comes to mind. then when we look at that, |
|
| 07:29 | interpreted, this then becomes the barrier that is the pro grading strand plane |
|
| 07:35 | here. We're looking at what was pro grading strand playing this filling in |
|
| 07:41 | title inland. Okay, so here's title and okay. And then this |
|
| 07:47 | out hips, uh is the flood Delta My pen once stood tickle |
|
| 07:57 | So this is the month and then , no, Settle minor in little |
|
| 08:01 | , that's where these Ah, what really Beach Regis or truncate? |
|
| 08:09 | Now, the nice thing is, interpretation is also based on on core |
|
| 08:14 | , well, logs, not just impacts, but let's look at what |
|
| 08:19 | , uh, core derived permeability And in that programming barrier corps, |
|
| 08:26 | goes from a maximum of over 2000 Darcy's to 1 to 2000. That |
|
| 08:38 | Ah, there are resident pro grading in the film, but with spit |
|
| 08:51 | is over 1000 and then the inlet , for most of the inlet and |
|
| 08:56 | Sodom Delta are less than ah 1000 Darcy. So clearly there's some strong |
|
| 09:04 | . And then when you look at , that detail, you see even |
|
| 09:07 | interesting parts. So this is the shore face of the shore face |
|
| 09:13 | This is that pro grading secrets that so familiar with now and there's an |
|
| 09:19 | in brain size. This is what's to as the barrier Corps And then |
|
| 09:25 | got that title. And with that is laterally migrating, okay? |
|
| 09:33 | we know that's got a somewhat uh, Phil pattern is going to |
|
| 09:40 | something like this. Remember that spit Ridge? It's gonna be increased grain |
|
| 09:51 | notices, um, coarsening downward until get to that. Okay, so |
|
| 10:00 | beginning to see that there are packages this, and so we look for |
|
| 10:05 | higher permeability ease, and this should been greater than ah, and we |
|
| 10:12 | for the highest perm abilities. So the core is going to be the |
|
| 10:15 | shore face and beach. Or for , Okay. In the laterally pro |
|
| 10:24 | . Handle it, Phil. it's gonna be the lower for of |
|
| 10:30 | in that ville. Disassociated with channel , of course, is highest |
|
| 10:35 | And we're gonna get some high I'm sorry. Well, they are |
|
| 10:42 | unity, but they're coarse grained, sorted spit deposits that cap the inland |
|
| 10:48 | prior to abandon. Now, also that there are some segments of the |
|
| 10:57 | that are muddy. Okay, so indicates basically periods of time where there |
|
| 11:02 | changes in the a pattern of mud during the latter of migration. And |
|
| 11:08 | get a little patch of the down , etcetera. So we begin to |
|
| 11:11 | how within each of these components we variations and permeability. Okay, |
|
| 11:20 | this is one of the different sand sandstone, and it's a transgressive |
|
| 11:27 | This is just the interpretation. I bother showing the details with a watch |
|
| 11:32 | fan complex coming in and then the over here. Okay, That is |
|
| 11:40 | similar at the same scale. Eyes we would see here with metta gonna |
|
| 11:53 | . So way could imagine Galveston Island kind of the model for the 41 |
|
| 12:02 | and then Matagorda Island, the model the Glasscock sand. And of |
|
| 12:06 | the up dip pinch out is where oil in this case the oil is |
|
| 12:14 | OK was in cross section, Of , is gonna look something like |
|
| 12:18 | Okay, Okay. Okay. S , this is just one example. |
|
| 12:26 | also that those examples that I gave a pro grading strand plane, the |
|
| 12:33 | properties and the modeling issues are pretty the same. Okay, The big |
|
| 12:38 | , of course, being the title . So what we've done is We've |
|
| 12:44 | at Strand playing barrier islands in both regressive pro grading setting and a transgressive |
|
| 12:53 | . But one do now is look estuaries, Okay? And estuaries. |
|
| 13:02 | of a bit of an issue with to definition, uh, there they |
|
| 13:08 | lead to find on solemnity. Fresh , diluted, freshwater, rather mixing |
|
| 13:15 | waters. But that's kind of an . No setting. I mean, |
|
| 13:21 | definition title influence. The Antolin extended sea reaching and remember, for us |
|
| 13:28 | upper limit of title rise. this is something at least that we |
|
| 13:33 | , presumably seeing the rock record. . Uh, and so if we |
|
| 13:39 | about solidity mixing, basically, this going to the definition of an |
|
| 13:49 | If we think of title influence, we're gonna look over here. |
|
| 13:58 | Uh, now what? I think as a quick aside, I was |
|
| 14:03 | in a lawsuit, uh, where was an expert witness on a an |
|
| 14:10 | of the Sanderson River. And after spending a lot of time discussing |
|
| 14:15 | effective subsided since on the curve ass in the area Ah, the judge |
|
| 14:21 | . Well, is this an And I said, Well, I |
|
| 14:24 | really see it is an estuary. , there's not a significant reduction changing |
|
| 14:32 | . And clearly the morphology is flu . Ah, But then the other |
|
| 14:38 | said well, but according to the records, those Anderson River shows toddle |
|
| 14:46 | all the way up to like Houston the dam. And I said, |
|
| 14:52 | , because what that did waas to that river no over river but in |
|
| 14:59 | and turns out that legally laws related are different than laws related river. |
|
| 15:06 | you never know where this particular distinction pop in? Uh huh. The |
|
| 15:13 | with both, in a way, that they're not very easily extended into |
|
| 15:19 | rock record. And so what we're at is a record where, |
|
| 15:27 | it is the limit of title She's okay and over the inland |
|
| 15:33 | anyway, and Seaworld limit of coastal at the mouth. These are face |
|
| 15:38 | that are influenced by times and Conclude your processes. So that's pretty |
|
| 15:44 | what we're going to use and what largely used in the geologic literature. |
|
| 15:49 | so what we've got is this even though it's below the zone of |
|
| 15:54 | influence, we don't have any Significant, uh, processes recorded. |
|
| 16:02 | , and so think of river processes a dominant here and then by Tommy |
|
| 16:08 | way out here. The river processes negligible, whereas marine processes, but |
|
| 16:18 | and tides or dominant. And, course, in clean, uh, |
|
| 16:22 | see ah mixing. And so we're kind of subbed about this into three |
|
| 16:30 | . A river dominated section where river are dominant. A marine dominated section |
|
| 16:38 | marine processes air dollar and then a energy. Okay, so Galveston Day |
|
| 16:44 | out to be a good estuary of type. If we kind of modified |
|
| 16:48 | little bit to look at settlement, see that there's some sediment that's coming |
|
| 16:52 | here with from the bay we see some settlement that's coming out in this |
|
| 16:59 | . Uh oh. This sediment is from erosion. But this settlement here |
|
| 17:05 | coming from the bay. And if look at the percent sand, one |
|
| 17:13 | that I think you see is that got wash over two pauses, that |
|
| 17:18 | extending ah, sediments into this You got little bit of sediments over |
|
| 17:26 | . Okay? And so what? defined is an area that's influenced by |
|
| 17:31 | processes, a little bit of river in here, and then the rest |
|
| 17:37 | basically gonna be a mud. That be the scent mixed zone. So |
|
| 17:43 | is a, uh, on estuary we would consider a wave dominated |
|
| 17:50 | Okay, tides are not a big , and that's going to distinguish it |
|
| 17:54 | a tide dominated this jewelry, which deal with it in a moment. |
|
| 17:58 | let's look at that. Waved on dish. Rethink Galveston Were they had |
|
| 18:05 | over here. We've got barrier islands wash overs and flood title Delta Over |
|
| 18:12 | . This is the kind of cross that we've been looking at. Here's |
|
| 18:16 | programming beta delta. And so we back to Galveston, and that's pretty |
|
| 18:21 | what we're looking here is the flood Delta and the wash overs. |
|
| 18:27 | that's over here. Here is that extent. Have this the influence on |
|
| 18:35 | what? We don't have here very , but we've got we've got essentially |
|
| 18:39 | head down to sitting up here. , So the wave dominated deltas are |
|
| 18:46 | to visualize their relatively straightforward in terms the face she's and clearly all the |
|
| 18:52 | that we see here our face, associated Barrier Islands. And so the |
|
| 19:01 | difference now is that it's confined into type of a alluvial valley, and |
|
| 19:09 | gonna have a s Terreri s marine dominant system here in village. And |
|
| 19:19 | had Delta's pro grading. Yeah, this setting right here in a And |
|
| 19:26 | is a cross section of a we've got a marine transgression. |
|
| 19:34 | we've got some titling from, So is the transgressive barrier island cross section |
|
| 19:40 | we talked about. Okay. Ocean , air causing transgression. OK, |
|
| 19:48 | here's that they had Delta. That's of pro grading out a little |
|
| 19:52 | Now, with time that Delta has to fill in the upper part of |
|
| 20:02 | bay. Meanwhile, we still according to this model of transgression. |
|
| 20:10 | we're we're still having sediments coming in here. And eventually that river completely |
|
| 20:22 | the Esther where, but knows we have erosion and transgression here. |
|
| 20:28 | so we still have a transgressive barrier . Uh, it turns out that |
|
| 20:33 | it continued, we're going to start transform. In fact, at this |
|
| 20:38 | , you could argue that we no have a barrier. There's no lagoon |
|
| 20:45 | . It is part of a I'm probably a wave dominated Delta. |
|
| 20:51 | , so by the time we get this ah, it's a wave dominated |
|
| 20:57 | . Okay, Now, a couple things toe No, on this, |
|
| 21:03 | , the transition from a an estuary barrier bar to away dominated Delta basically |
|
| 21:12 | the river to fill the estuary. that's what's happened in the Brazos |
|
| 21:17 | where the Colorado River Okay, that rivers had enough sediment that they fill |
|
| 21:22 | estuary. Unlike the trend A in Santa, which have yet to |
|
| 21:29 | Young said they Oh, so we that transition from barrier islands in pro |
|
| 21:36 | , a filling of an estuary to dominated. The other thing, |
|
| 21:41 | is that notice in this case, never go to a Galveston Island Pro |
|
| 21:47 | ation until the river starts emptying sediment into the near shore zones. At |
|
| 21:56 | point, we're gonna begin toe have gradation, according to this example. |
|
| 22:02 | the reason is, there's not much coming in to allow the delta, |
|
| 22:09 | though you're at a high stand to in other cases. Maybe because of |
|
| 22:16 | , erosion? Yeah, or or sources. There's no reason why that |
|
| 22:24 | couldn't have become a regressive barrier, as the island was a rather even |
|
| 22:29 | the estuary was Philip. And that , of course, was happened in |
|
| 22:33 | Island, Galveston Island. This is . I rather gums an estuary, |
|
| 22:39 | gobs and island. Except that it pro grading. Now follow Thailand. |
|
| 22:47 | on the bottom was transgressing. So whole issue of what's going on along |
|
| 22:53 | wave dominated front is in some ways of what's going on to that river |
|
| 23:02 | back bay. Okay, yeah. here we've got this trend. |
|
| 23:09 | first of all, we're in a valley. That's where most of our |
|
| 23:13 | estuaries occur today. And so, sea level rose, we had that |
|
| 23:20 | surface. It rose to here, maybe even here. And we also |
|
| 23:29 | that that be flooding of the seaward of the estuary. And they had |
|
| 23:40 | kept back stepping until right here. at this point that they had Delta's |
|
| 23:46 | to fill the upper part of the . Okay, Now, in this |
|
| 23:55 | , as soon as the estuary is , we begin to see the pro |
|
| 24:01 | ation of what is now a wave delta. Okay, now, if |
|
| 24:07 | look at it a little differently, think it's easier. Individualist. What's |
|
| 24:11 | on? Ah, I kind of this style of of, ah, |
|
| 24:18 | that is here Is that pro This is a wielder diagram of |
|
| 24:22 | This pro grading, uh, sure . Okay. And what we're preserving |
|
| 24:31 | the inland face. She's from the islands. There's going to be title |
|
| 24:36 | Let's wash over. Fans knows there's funny little thing right here. We |
|
| 24:41 | it up a little kosher. That is a little erosion all |
|
| 24:49 | That's the result of lateral erosion of title inland in combination with these wash |
|
| 24:56 | so and then the whole thing is by erosion. That's why that looks |
|
| 25:01 | here we've had a little bit of ah regression on from the day title |
|
| 25:08 | Beta delta and then transgressed again. typical. During a rise in sea |
|
| 25:14 | , little pauses in the increase of level or the sediment supply because these |
|
| 25:20 | go back and forth and then right , red on rental Children. |
|
| 25:25 | we began filling of the bay, Delta and Delta plane. And then |
|
| 25:30 | this point, ah, two we have resulted in in a pro |
|
| 25:39 | . Well, we have dominated Pretty straightforward. This is Ah, |
|
| 25:44 | model to vision. And if you're sequenced photography our high stand track begins |
|
| 25:55 | the sediment load sediment budget basically allows to increase had a rate greater than |
|
| 26:07 | energy. Okay, greater if you the rise in sea level. So |
|
| 26:12 | quit flooding the valley, and we to fill the estuary, and we |
|
| 26:18 | to Well, at some point pro out, Siemer. Okay, there's |
|
| 26:24 | lot of erosion surfaces here. sequence. Boundary if you like. |
|
| 26:30 | that basil Rozenhal? Scour? That's the valley filled around sorry valley in |
|
| 26:37 | Valley and then a sui go up is that you wave a revetment |
|
| 26:44 | That's the, uh, erosion surface rise in water level. These |
|
| 26:52 | uh, there's a title ravine. , let's see. Hang on. |
|
| 27:04 | , yeah. Uh, these are ravines here. Caused by that erosion |
|
| 27:18 | lateral migration of the title inlet. are some erosion. All features here |
|
| 27:27 | with variations in the they had, , Delta. The transgressive surface is |
|
| 27:37 | the area that was flooded, but flooding they actually extend out to |
|
| 27:46 | Okay, uh, but there's not an erosion all, Oh, Fator |
|
| 27:52 | with that. So this is gonna a complex cryptography when you look at |
|
| 27:56 | in detail. But we've looked at . We know exactly what each of |
|
| 28:03 | is gonna look like. Well, we even know this flu ville a |
|
| 28:08 | system here. So the only thing really little uneasy about is that they |
|
| 28:13 | Delta and the wave dominated ill, we'll get to. Here's an |
|
| 28:20 | This is the type of river. are basically, uh, contours of |
|
| 28:26 | buried Stieber Valley. Ah, Into a low stand. Oh, |
|
| 28:35 | then this is the present pro grading . And so what we're interested in |
|
| 28:47 | how that valley filled to form, , the estuary and and this is |
|
| 28:51 | it's filled. Here's the modern It's a way dominated delta. So |
|
| 29:00 | got, uh, pro grading way deposits. Okay, here's that basil |
|
| 29:14 | . And here are those a little re interests that were associated with the |
|
| 29:25 | overs in title, Endless. And here? No, thank. Or |
|
| 29:32 | we've got, uh, basically some our I think I'm just second our |
|
| 29:43 | plane. Uh, well s ring Delta plane deposit sitting in there. |
|
| 29:50 | . And, uh, yeah, our low stand Delta. Then here |
|
| 29:56 | a delta front transgressive surface. Another fraud, transgressive. And then Delta |
|
| 30:04 | . Okay, so here's the central that they had. Delta, This |
|
| 30:10 | the outer basin. And then this the high stand fan. Okay, |
|
| 30:15 | it's a nice example. Um, the strata graphic record would be of |
|
| 30:23 | filling of a wave dominated delta. sorry. Filling of a wave dominated |
|
| 30:32 | and transforming into a wave dominated Okay, so that's pretty much what |
|
| 30:39 | got here. Now. We did cross section of Galveston Bay. This |
|
| 30:48 | at ball of a rose. This the pro grading shore face alone |
|
| 30:55 | All here. There's a lateral migration with the title India. But what |
|
| 31:00 | see is we go from flu viel there. To some, they had |
|
| 31:10 | , but mainly we're looking at tattle . And so what we are realizing |
|
| 31:20 | that if this is a cross section , there's a large in size |
|
| 31:29 | Okay, Right in here. For , this is the estuary. It |
|
| 31:38 | completely filled. So we had esta deposits until they were covered with bay |
|
| 31:49 | . I mean, with barrier on deposits. So estuarine deposits continue underlie |
|
| 31:57 | whole area. Okay, so if ever got enough, sediment would see |
|
| 32:03 | like this. But until then, stuck in this zone right in |
|
| 32:10 | Okay? We haven't really seen the in the bay. Okay, |
|
| 32:16 | if we look, it waved down coastlines, we see a transition, |
|
| 32:25 | we can also look at I'm From wave to tie dominated coast |
|
| 32:30 | we can also look at the transition wave to tide dominated estuaries. |
|
| 32:36 | And so notice. In this there's ah re entrant here. That's |
|
| 32:43 | estuary. And instead of barrier we have elongated title bars and we |
|
| 32:52 | instead of a they had Delta. have a title river with extensive salt |
|
| 33:03 | , and lastly, there's actually a common or system adding transition from relatively |
|
| 33:12 | to highly meandering to relatively straight wherever into a V shaped estuary. So |
|
| 33:18 | is the typical pattern, man. of a tide dominated delta. |
|
| 33:26 | And so here there may be some , but they're really not very |
|
| 33:30 | Uh, tidal currents are doing And why are they doing this? |
|
| 33:36 | are the increasing? Well, because being amplified is you go into that |
|
| 33:43 | shape, reenter, and then they until some point there. Negligible river |
|
| 33:50 | influence. Basically, guys here. then what we find is that this |
|
| 33:59 | Ah, the upper part of the is filled with reverted pauses. But |
|
| 34:06 | lower part is basically time Don't Okay. And there's some implications in |
|
| 34:14 | of being great size. Uh Suspended sediment concentration. We've got course |
|
| 34:20 | settlement this flu via leading derived, , coarser sediment, that is Marine |
|
| 34:27 | . The zone in here is actually bi directional currents, uh, out |
|
| 34:36 | hairs, maybe flood dollars out in . It's uni directional. Ah, |
|
| 34:41 | clearly the sentiment transport in the sedimentary are a lot different. In a |
|
| 34:49 | dominated delta weighed down. A deltas easy. Okay, Tie dominated. |
|
| 34:54 | so much catch. Uh, so of things we see is that, |
|
| 35:00 | , we've got the different, deposition components of a tide dominated |
|
| 35:08 | This is the what he calls the string funnel. Ah, and there's |
|
| 35:14 | inner funnel and an outer funnel. Inter funnel consists of a series of |
|
| 35:20 | titled sandbars entitled Sand Flats. the title. Sand flats find |
|
| 35:27 | You remember that? Ah, the sandy. Ah, sand flattened rating |
|
| 35:34 | into the upper mud flat. The sandbars. We haven't really looked at |
|
| 35:38 | yet, but they're gonna course in . OK, so we have a |
|
| 35:44 | uppers and finding upward sequence. this is the coarsening upwards bar, |
|
| 35:51 | then this is the, uh, down. We're title flat. |
|
| 35:58 | You don't need to read these, look at the low Thala. |
|
| 36:02 | Heavily genius. Lenticular Betty. bi directional currents. Uh, clean |
|
| 36:10 | betting medium trough. Cross betting hit realistic ripples. Hedonistic, wavy |
|
| 36:17 | So what? We're looking at our of the title flab and the title |
|
| 36:25 | . Okay. And so the title from bottom to top is getting coarser |
|
| 36:32 | . I might read these to you , there, but notice Sing little |
|
| 36:35 | betting mud drapes. Uh, and , there's gonna be a lot of |
|
| 36:45 | betting in here. So the title down here, huh? McKay cross |
|
| 36:50 | a wavy betting. We're getting down storm influence between the bars. The |
|
| 36:57 | themselves are showing wave and tide Okay. Yeah. Uh, here |
|
| 37:07 | a series of different types of sediment areas where you had grain coatings and |
|
| 37:17 | filled highest probability. That's because it caused the least amount of courts over |
|
| 37:25 | down in here where we had solicit. Occassion is where you had |
|
| 37:31 | least amount of chloride coating. So tribal chloride is restricted to the sandbar |
|
| 37:40 | and it was deposited the end of , transgressive face. She's And so |
|
| 37:44 | we've got is this setting, uh they kind of seen it as a |
|
| 37:52 | of early wave dominated, which, the way, had a small amount |
|
| 38:01 | clays, a lot of wave grading up into a tide dominated with |
|
| 38:08 | lot of plays and preservation of Now, this transition from wave dominated |
|
| 38:18 | to tie dominated estuary is one that's common in transgressions. So, |
|
| 38:24 | first of all, this is not unusual sequence to see and equally |
|
| 38:31 | some ways the, uh, tendency tide dominated estuaries to preserve plays means |
|
| 38:39 | got a better chance of having clay precipitated and preventing courts over grows. |
|
| 38:49 | . Time dominated in stories feel as . It is just that they don't |
|
| 38:53 | a whole lot different. The tide . Essentially, we're going from a |
|
| 39:02 | dominated sediment transport and abdominal dated sediment as we fill those estuaries. |
|
| 39:11 | I said earlier that there was kind , ah, on area of trapping |
|
| 39:17 | , sentiment being arrived from the Marine in the title sandbars from the |
|
| 39:24 | Well, that's pushed out. And we have titled Sandbars now that are |
|
| 39:31 | fed by marine deposits. I mean flow beall deposits. So we go |
|
| 39:37 | these s Tareen sandbars to these title . Okay. Ah ! And so |
|
| 39:48 | go from this Lo suspended at a area here, so he pushed it |
|
| 39:54 | . So the grain size now is by the rivers. Suspended sediment concentration |
|
| 40:04 | is in this area here. That's , of course, because that's where |
|
| 40:09 | clays they're going to be deposited on of the sands And so that's where |
|
| 40:15 | Genesis might play a part. So went from a, uh, suspended |
|
| 40:27 | . I didn't have it in this being over here. Two suspended. |
|
| 40:34 | is being over here, and this just an example of the tide |
|
| 40:39 | Dealt. He's got that V shaped . He's got that straight to waving |
|
| 40:45 | straight channel. It's got this increased range up to the mouth, and |
|
| 40:53 | it decreases with distance. Okay, , and notice here. Now we |
|
| 40:59 | from barrier islands oriented parallel to the two title Sandridge is okay, |
|
| 41:09 | with the prevailing winds being in this . So this is a good |
|
| 41:15 | Um, a time dominated Delta. has a lot of the shared characteristics |
|
| 41:24 | a time dominated estuary. And these just some examples of these the fan |
|
| 41:31 | morphology which is associated with these tide systems. Okay, that's for, |
|
| 41:40 | , barriers and estuaries. Well, me record the s. Let me |
|
| 41:53 | Zooey recording and stop the It is . 20. We just had a |
|
| 42:02 | break. So look, break about minutes to stretch your legs and then |
|
| 42:06 | on back in about 10. 25 so That'll give me time to |
|
| 42:11 | uh, |
|
