Re: [dinosaur] Plesiosaur queries

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

In proper stratigraphic terms, this wouldn't be the "Alum Shales", it would be the "Alum Shales Member of the Whitby Mudstone".

On Tue, Nov 24, 2020 at 3:13 AM Mark Wildman <saurian@live.co.uk> wrote:

Well yes that is correct. The Alum Shales in this case, however, are part of the Whitby Mudstone Formation (Upper Lias) for clarity.

Regards,

MarkÂ

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From: dinosaur-l-request@mymaillists.usc.edu <dinosaur-l-request@mymaillists.usc.edu> on behalf of dawidmazurek@wp.pl <dawidmazurek@wp.pl>
Sent: 24 November 2020 07:41
To: dinosaur-l@usc.edu <dinosaur-l@usc.edu>
Subject: Odp: [dinosaur] Plesiosaur queries

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Dnia 24 listopada 2020 05:03 John Schneiderman <john-schneiderman@cox.net> napisaÅ(a):

formation: Alum Shale Formation (or Whitby Mudstone)

age: early Jurassic, Toarcian

Alum Shale Formation is Cambrian to Lower Ordovician in age, and famous for its Orsten-type preserved fossils. Outcroups are in Scandinavia.Â

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