Talk:Morrison Formation

This article is rated B-class on Wikipedia's content assessment scale.
It is of interest to the following WikiProjects:

Dinosaurs Mid‑importance

	Dinosaurs portal This article is within the scope of WikiProject Dinosaurs, a collaborative effort to improve the coverage of dinosaurs and dinosaur-related topics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.DinosaursWikipedia:WikiProject DinosaursTemplate:WikiProject Dinosaursdinosaurs articles
Mid	This article has been rated as Mid-importance on the project's importance scale.

Geology Low‑importance

	Geology portal Talk:Morrison Formation is part of WikiProject Geology, an attempt at creating a standardized, informative, comprehensive and easy-to-use geology resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information.GeologyWikipedia:WikiProject GeologyTemplate:WikiProject GeologyGeology articles
Low	This article has been rated as Low-importance on the project's importance scale.

South Dakota Low‑importance

	South Dakota portal This article is within the scope of WikiProject South Dakota, a collaborative effort to improve the coverage of the U.S. state of South Dakota on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.South DakotaWikipedia:WikiProject South DakotaTemplate:WikiProject South DakotaSouth Dakota articles
Low	This article has been rated as Low-importance on the project's importance scale.

Montana Low‑importance

	Montana portal This article is within the scope of WikiProject Montana, a collaborative effort to improve the coverage of the U.S. state of Montana on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.MontanaWikipedia:WikiProject MontanaTemplate:WikiProject MontanaMontana articles
Low	This article has been rated as Low-importance on the project's importance scale.

United States: Texas Low‑importance

	United States portal This article is within the scope of WikiProject United States, a collaborative effort to improve the coverage of topics relating to the United States of America on Wikipedia. If you would like to participate, please visit the project page, where you can join the ongoing discussions. Template Usage Articles Requested! Become a Member Project Talk Alerts United StatesWikipedia:WikiProject United StatesTemplate:WikiProject United StatesUnited States articles
Low	This article has been rated as Low-importance on the project's importance scale.
	Texas portal This article is supported by WikiProject Texas (assessed as Low-importance).

Palaeontology High‑importance

	Paleontology portal This article is within the scope of WikiProject Palaeontology, a collaborative effort to improve the coverage of palaeontology-related topics and create a standardized, informative, comprehensive and easy-to-use resource on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PalaeontologyWikipedia:WikiProject PalaeontologyTemplate:WikiProject PalaeontologyPalaeontology articles
High	This article has been rated as High-importance on the project's importance scale.

Canada: Geography Low‑importance

	Canada portal This article is within the scope of WikiProject Canada, a collaborative effort to improve the coverage of Canada on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.CanadaWikipedia:WikiProject CanadaTemplate:WikiProject CanadaCanada-related articles
Low	This article has been rated as Low-importance on the project's importance scale.
	This article is supported by WikiProject Geography of Canada.
	This article has been automatically rated by a bot or other tool because one or more other projects use this class. Please ensure the assessment is correct before removing the `\|auto=` parameter.

Corrected dating of the end of deposition of the Morrison Formation

If the Morrison Formation is dated from 155 Ma to 147 Ma then it must have ended at 147 Ma not 155 Ma. Also the NPS website (http://www.nps.gov/archive/dino/morrison.htm) for Dinosaur National Monument states that deposition ended 147 Ma. The NPS site also says that the unconformity lasted 15 Ma to 20 Ma not 30 Ma. Dr. Morbius 00:38, 27 May 2007 (UTC)[reply]

Oldest radiometric age: 156.3 + 2 Ma (TRUJILLO, K.C., K. R. CHAMBERLAIN, and A. STRICKLAND. 2006. Oxfordian U/Pb ages from SHRIMP analysis for the Upper Jurassic Morrison Formation of southeastern Wyoming with implications for biostratigraphic correlations. Geological Society of America Abstracts with Programs, 38(6): 7). Youngest age: 146.8+1 Ma (Bilbey, S.A. 1998. Cleveland-Lloyd Dinosaur Quarry - age, stratigraphy and depositional environments. Pp. 87-120, in The Morrison Formation: An Interdisciplinary Study (K. Carpenter, D. Chure, and J.I. Kirkland, eds.). Modern Geology, 22.)Anky-man 00:43, 22 October 2007 (UTC) —Preceding unsigned comment added by Anky-man (talk • contribs)

Now added - thank you! J. Spencer 04:47, 22 October 2007 (UTC)[reply]

Oldest date for the base of the Morrison Formation is based on two dates from the Tidwell Member, one at 156.77+/-0.55 Ma (Notom UT) and 156.84+/-0.59 Ma from Rainbow Park (Truillo and Kowallis, 2015 here: https://giw.utahgeology.org/giw/index.php/GIW/article/view/6/4 ). Currently 156.7 Ma is the date used. The previous youngest date of 146.8 has not been replicated and has been tossed out as possibly contaminated. The youngest current dates are several meters below the top of the Brushy Basin Member at 150.0+/-0.5 Ma at Little Cedar Mountain, UT (reference: Christiansen, E.H., Kowallis, B.J., Dorais, M.J., Hart, G.L., Mills, C.N., Pickard, M., and Parks, E., 2015, The record of volcanism in the Brushy Basin Member of the Morrison Formation: Implications for the Late Jurassic of western North America, in Anderson, T.H., Didenko, A.N., Johnson, C.L., Khanchuk, A.I., and MacDonald, J.H., Jr., eds., Late Jurassic Margin of Laurasia—A Record of Faulting Accommodating Plate Rotation: Geological Society of America Special Paper 513, p. 1–XXX, doi:10.1130/2015.2513(11). Carpenter, Kenneth (talk) 21:03, 30 November 2022 (UTC)[reply]

Update Table

I've noticed the table titled "Placeholders of the Placeholder Formation" remains unfilled and has been like that since July 19th. Is anyone going to edit it or can I go ahead and fill it in?Smokeybjb (talk) 01:06, 9 August 2008 (UTC)[reply]

If you want to, I'd say go ahead. J. Spencer (talk) 01:16, 9 August 2008 (UTC)[reply]

It either needs filling in or deletion, rather ugly and pointless as is. Vsmith (talk) 01:21, 9 August 2008 (UTC)[reply]

Thankyou. I'll start filling it in now. Smokeybjb (talk) 01:25, 9 August 2008 (UTC)[reply]

Reptiles of the Morrison Formation

Whatever happened to the table titled "Reptiles of the Morrison Formation"? Should it be readded, or should there be seperate tables for turtles, crocodilians, sphenodonts, e.t.c.? Smokeybjb (talk) 03:21, 11 August 2008 (UTC)[reply]

Paleobiota of the Morrison Formation Abyssal (talk) 14:50, 22 July 2010 (UTC)[reply]

Insects

I don't know that it is accurate to say "Insects were very similar to modern species, with termites building 30 m (100 ft.) tall nests". Termites, yes, OK, but could the the hymenoptera, diptera, beetles be described as very similar? Almost all the lepidoptera evolved in the Upper Cretaceous, parallel to flowering plants. And you don't really mean "species", or do you? I would have thought "order" or "family" was more like it. Just what were the insects found in the Morrison Formation? Macdonald-ross (talk) 10:59, 6 February 2013 (UTC)[reply]

External links modified (January 2018)

Hello fellow Wikipedians,

I have just modified 2 external links on Morrison Formation. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 05:07, 23 January 2018 (UTC)[reply]