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Our Tr-J Stratigraphy
Topic Started: Jan 10 2013, 09:41 PM (150 Views)
DK1000
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In the MN universe, the Triassic-Jurassic extinction event (Tr-J) did not occur, and I feel this would certainly affect our stratigraphy.

The end of the Triassic and the beginning of the Jurassic in our timeline is marked by the Tr-J extinction, and without it there is no longer any geological boundaries at this time to separate the Triassic and Jurassic periods. To amend this stratigraphic anomaly, I propose that (in the MN universe) the Triassic/Jurassic boundary is marked by the separation of Laurasia and Gondwana, c. 180 million years ago, pulling the end of the Triassic forward by 21 million years from c. 201 million years ago to c. 180 million years ago.

In doing so, much of (what is in our universe) the Lower Jurassic becomes part of the Triassic. I would suggest that the Hettangian epoch becomes part of the Rhaetian, and the Sinemurian and Pliensbachian epochs becoming the second last and last epochs of the Triassic period respectively, with the Toarcian becoming the first epoch of the Jurassic. In our timeline, though, the Lower Jurassic ends with the Toarcian, which means for us the Lower Jurassic must be pulled forward in the MN timeline. I would suggest we extend the Lower Jurassic up through the Middle Jurassic to the end of the Callovian, with the Upper Jurassic beginning in the Oxfordian as it does in our universe. In doing so, the Middle Jurassic is removed from the MN timeline, leaving only the Lower Jurassic (c.180 to 161 mya) and the Upper Jurassic (c. 161 to 145 mya).

From then, I think we would be fine having the stratigraphy remain the same as it does in our universe.
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the dark phoenix
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DK1000
Jan 10 2013, 09:41 PM
In the MN universe, the Triassic-Jurassic extinction event (Tr-J) did not occur, and I feel this would certainly affect our stratigraphy.

The end of the Triassic and the beginning of the Jurassic in our timeline is marked by the Tr-J extinction, and without it there is no longer any geological boundaries at this time to separate the Triassic and Jurassic periods. To amend this stratigraphic anomaly, I propose that (in the MN universe) the Triassic/Jurassic boundary is marked by the separation of Laurasia and Gondwana, c. 180 million years ago, pulling the end of the Triassic forward by 21 million years from c. 201 million years ago to c. 180 million years ago.

In doing so, much of (what is in our universe) the Lower Jurassic becomes part of the Triassic. I would suggest that the Hettangian epoch becomes part of the Rhaetian, and the Sinemurian and Pliensbachian epochs becoming the second last and last epochs of the Triassic period respectively, with the Toarcian becoming the first epoch of the Jurassic. In our timeline, though, the Lower Jurassic ends with the Toarcian, which means for us the Lower Jurassic must be pulled forward in the MN timeline. I would suggest we extend the Lower Jurassic up through the Middle Jurassic to the end of the Callovian, with the Upper Jurassic beginning in the Oxfordian as it does in our universe. In doing so, the Middle Jurassic is removed from the MN timeline, leaving only the Lower Jurassic (c.180 to 161 mya) and the Upper Jurassic (c. 161 to 145 mya).

From then, I think we would be fine having the stratigraphy remain the same as it does in our universe.
i agree with this
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Dilophoraptor
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DK1000
Jan 10 2013, 09:41 PM
In the MN universe, the Triassic-Jurassic extinction event (Tr-J) did not occur, and I feel this would certainly affect our stratigraphy.

The end of the Triassic and the beginning of the Jurassic in our timeline is marked by the Tr-J extinction, and without it there is no longer any geological boundaries at this time to separate the Triassic and Jurassic periods. To amend this stratigraphic anomaly, I propose that (in the MN universe) the Triassic/Jurassic boundary is marked by the separation of Laurasia and Gondwana, c. 180 million years ago, pulling the end of the Triassic forward by 21 million years from c. 201 million years ago to c. 180 million years ago.

In doing so, much of (what is in our universe) the Lower Jurassic becomes part of the Triassic. I would suggest that the Hettangian epoch becomes part of the Rhaetian, and the Sinemurian and Pliensbachian epochs becoming the second last and last epochs of the Triassic period respectively, with the Toarcian becoming the first epoch of the Jurassic. In our timeline, though, the Lower Jurassic ends with the Toarcian, which means for us the Lower Jurassic must be pulled forward in the MN timeline. I would suggest we extend the Lower Jurassic up through the Middle Jurassic to the end of the Callovian, with the Upper Jurassic beginning in the Oxfordian as it does in our universe. In doing so, the Middle Jurassic is removed from the MN timeline, leaving only the Lower Jurassic (c.180 to 161 mya) and the Upper Jurassic (c. 161 to 145 mya).

From then, I think we would be fine having the stratigraphy remain the same as it does in our universe.
what about the K-T, sense that didn't happen eather? Will it be when Grass appears?

Also trying to get a Viewable Timeline made ATM, DA is being a pain
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DK1000
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Dilophoraptor
Jan 11 2013, 12:14 AM
what about the K-T, sense that didn't happen eather? Will it be when Grass appears?
I thought that was something separate?
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Dilophoraptor
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DK1000
Jan 11 2013, 12:16 AM
Dilophoraptor
Jan 11 2013, 12:14 AM
what about the K-T, sense that didn't happen eather? Will it be when Grass appears?
I thought that was something separate?
Got the Timeline up BTW
Posted Image
sorry for the size.

Anyways the K-T extinction event didn't occur eather, so when will that boundary appear?
Edited by Dilophoraptor, Jan 11 2013, 12:19 AM.
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DK1000
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Well if we're removing the K-Pg extinction too, then I'd say we do what Spec did.
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Dilophoraptor
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DK1000
Jan 11 2013, 12:38 AM
Well if we're removing the K-Pg extinction too, then I'd say we do what Spec did.
which was?
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the dark phoenix
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Dilophoraptor
Jan 11 2013, 02:22 AM
DK1000
Jan 11 2013, 12:38 AM
Well if we're removing the K-Pg extinction too, then I'd say we do what Spec did.
which was?
Frost said that the meteor that should have doomed these creatures broke up so maybe the ones that where lucky to get through the atmosphere would have created climate change

I also think we should start the project's time in the Olenekian of the early Triassic that way we don't have dinos in the first place(Nyasasaurus was found in the Anisian)

and i know you don't wish to speak about animals yet Dk1000 but i have a suggestion

can Dinosauromorphs(Lagerpetids, Lagosuchus, Marasuchus, Saltopus, and Silesaurids no true dinosaurs) be part of this?

i can see our dracosuchids in their future
Edited by the dark phoenix, Jan 11 2013, 03:19 AM.
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Dilophoraptor
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the dark phoenix
Jan 11 2013, 03:10 AM
Dilophoraptor
Jan 11 2013, 02:22 AM
DK1000
Jan 11 2013, 12:38 AM
Well if we're removing the K-Pg extinction too, then I'd say we do what Spec did.
which was?
Frost said that the meteor that should have doomed these creatures broke up so maybe the ones that where lucky to get through the atmosphere would have created climate change

I also think we should start the project's time in the Olenekian of the early Triassic that way we don't have dinos in the first place(Nyasasaurus was found in the Anisian)

and i know you don't wish to speak about animals yet Dk1000 but i have a suggestion

can Dinosauromorphs(Lagerpetids, Lagosuchus, Marasuchus, Saltopus, and Silesaurids no true dinosaurs) be part of this?

i can see our dracosuchids in their future
http://s13.zetaboards.com/Project_MesozoicNova/topic/789042/1/

No, Aliens or gravity pulled it up to the moon
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the dark phoenix
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well any other plans?
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DK1000
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In retrospect, it might be a good idea to pull the J-K boundary forward, as the Jurassic becomes rather short here. There's no major reason as to why the J-K boundary is where it is in our stratigraphy, so pulling it forward couldn't hurt.

Edit: I am currently working on this, as well as incorporating the lack of K-Pg extinction as well.

EDIT 17/3/13: Okay, I think I have a solution.

I suggest we pull the J-K boundary forward to the end of the Barremian stage of the Cretaceous, as the end of the Barremian is marked by a geomagnetic reversal at the start of the M0r chronozone, which I think would make a suitable boundary marker. In doing so, the Jurassic will be extended by another 15 million years, thus making it last 58 million years (c.183-c.125 million years), rather than 38 million years (c.183-c.145 million years) I had previously suggested. This would thus make the Berriasian, Valanginian, Hauterivian and Barremian stages part of the Jurassic period. Furthermore, I suggest that the aforementioned stages become the Late Jurassic, while the previous stages of the Late Jurassic (Oxfordian, Kimmeridgian and Tithonian) become the Middle Jurassic, with the Early Jurassic remaining as it is (Toarcian, Aalenian, Bajocian, Bathonian and Callovian).

I hope I'm not being too confusing, I feel I could have worded this better. Expect a diagram to illustrate this at some point in the future, hopefully that will make things clearer.
Edited by DK1000, Mar 17 2013, 04:39 PM.
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the dark phoenix
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I might be the only one that does not get it. But I'll manage, I am more interested in hearing more about the biology rather than the time.
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DK1000
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The zoology is often the most eye-catching aspects of these speculative projects, and is what usually draws people in. But I personally find a good speculative project goes beyond just the zoology, to create a more in depth, and more interesting project. It adds more realism to it I think.
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DK1000
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Can't believe I forgot about this, but the stratigraphy of the Triassic has to be modified too. I propose that the lower Jurassic be extended up to the end of the Ladinian, the Carnian and Norian making up the middle Triassic and the Rhaetian, Sinemurian and Pliensbachian being the upper Triassic. Revisions may be made to this in the future.

On another note, I think it would be easier for us to use real-world stratigraphy in discussions to avoid any confusion between us. Of course, I suggest the stratigraphy here be implemented in 'official' posts, but for simplicity's sake, real-world stratigraphy should probably be used by us. E.g. If I was to say 'Late Triassic' referring to Rhaetian-Pliensbachian, someone else may think I'm meaning 'Carnian-Rhaetian'. Real-world stratigraphy being the latter.
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Dilophoraptor
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if you want, i can redo my Mesozoic timeline, maybe add the Cenozoic too
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DK1000
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It seems that I have inadvertently placed the MN Tr-J boundary right on the 'Toarcian turnover', otherwise known as the Pliensbachian-Toarcian extinction, a minor extinction event. A good marker for the boundary if I do say so myself.
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the dark phoenix
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O_O


ok since I still have no clue what you said(I study more of Cretaceous than Triassic times) I propose we make a visual planner so maybe we can understand it slightly better

I am more of a visual learner than a literal one so I apologies if I sounded rude.
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DK1000
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Understandable, I can't explain concepts for beans.
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DK1000
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Well I've made a stratigraphic timeline to provide a visual diagram for what I've been rambling on about here:

Spoiler: click to toggle
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the dark phoenix
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cool works for me
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