Re: [dinosaur] North American Land Vertebrate Ages

[Thomas Richard Holtz <tholtz@umd.edu>]

NALMAs are *intended* to be continent-wide, but during the Cretaceous (unlike the Cenozoic) there isn't enough faunal continuity to do that (for obvious Western Interior Seaway reasons).

And at present there isn't any reason for a Cretaceous Appalachian Land Vertebrate Zone system because we don't have enough different sites from the same time to bother with correlation. (LMAs/LVAs exist to allow correlation: if you only have one site at any time slice, there is nothing to correlate.)

On Wed, Apr 14, 2021 at 1:33 AM Yazbeck, Thomas <yazbeckt@msu.edu> wrote:

I'm not sure if there are any, someone who knows more should supersede my answer with some more detailed info, but I think the practice is that these ages apply across the entire continent. There isn't much of a well-studied Cretaceous terrestrial fossil record from Appalachia during the Cretaceous. This paperÂhttps://pdfs.semanticscholar.org/45a5/84d4aa4d48fcc96f9cf8340685529a4f4a59.pdf doesn't use the NALVAs, probably purposely as they aren't super informative in the Appalachian (dinosaur) context.Â

Thomas Yazbeck

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From: dinosaur-l-request@mymaillists.usc.edu <dinosaur-l-request@mymaillists.usc.edu> on behalf of John Schneiderman <john-schneiderman@cox.net>
Sent: Wednesday, April 14, 2021 12:33 AM
To: dinosaur-l@usc.edu <dinosaur-l@usc.edu>
Subject: [dinosaur] North American Land Vertebrate Ages

Â

What are the Cretaceous Appalachian equivalents to the Laramidian North American Land Vertebrate Ages (NALVA)?

(upper Maastrichtian) Lancian

Edmontonian

Judithian

Aquilan

Fencelakian

(Cenomanian) Mussentuchian

& (upper Albian) Cashanranchian

John Schneiderman

john-schneiderman@cox.net

--

Thomas R. Holtz, Jr.
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