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The Amateur Paleontologist

Grand Canyon Paleontology

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The Amateur Paleontologist

Hey y'all, hope you're all having a good time! ;) 

 

This recently published report by Hodnett & Elliott (2018) describes two fairly diverse chondrichthyan faunas from the late Mississippian/early Pennsylvanian of western Grand Canyon (Arizona). The assemblages, from 2 separate formations, are described on the basis of quite many tooth specimens, and other material (i.e. denticles). Differences between those faunas and other similar-aged Euro-American faunas indicate paleogeographical implications relating to the formation of Pangaea.

 

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Hodnett, J. P. M., & Elliott, D. K. (2018). Carboniferous chondrichthyan assemblages from the Surprise Canyon and Watahomigi formations (latest Mississippian–Early Pennsylvanian) of the western Grand Canyon, Northern Arizona. Journal of Paleontology92(S77), 1-33.

 

Abstract:

Two chondrichthyan assemblages of Late Mississippian/Early Pennsylvanian age are now recognized from the western Grand Canyon of northern Arizona. The latest Serpukhovian Surprise Canyon Formation has yielded thirty one taxa from teeth and dermal elements, which include members of the Phoebodontiformes, Symmoriiformes, Bransonelliformes, Ctenacanthiformes, Protacrodontoidea, Hybodontiformes, Neoselachii (Anachronistidae), Paraselachii (Gregoriidae, Deeberiidae, Orodontiformes, and Eugeneodontiformes), Petalodontiformes, and Holocephali. The euselachian grade taxa are remarkably diverse with four new taxa recognized here; the Protacrodontidae: Microklomax carrieae new genus new species and Novaculodus billingsleyi new genus new species, and the Anchronistidae: Cooleyella platera new species and Amaradontus santucii new genus new species. The Surprise Canyon assemblage also has the youngest occurrence of the elasmobranch Clairina, previously only known from the Upper Devonian. The Surprise Canyon Formation represents a nearshore fluvial infilling of karstic channels, followed by a shallow marine bioherm reef, and finally deeper open water deposition. The early Bashkirian Watahomigi Formation represents open marine deposition and contains only two taxa: a new xenacanthiform, Hokomata parva new genus new species, and the holocephalan Deltodus. The relationship between the Surprise Canyon and Watahomigi chondrichthyan assemblages and other significant coeval chondrichthyan assemblages suggests that there may have been eastern and western distinctions among the Euamerican assemblages during the Serpukhovian due to geographic separation by the formation of Pangea.

 

Here's the paper :) Hodnett & Elliott 2018 Grand Canyon chondr. fauna.pdf

 

Happy New Year to you all!!

 

-Christian

Edited by The Amateur Paleontologist

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DeepTimeIsotopes

Thanks! I’ll ring in the new year reading about Grand Canyon fishes.:ighappy:

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Fossildude19

Thanks for posting. 

Moved to Documents.  ;) 

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The Amateur Paleontologist
34 minutes ago, Fossildude19 said:

Moved to Documents

Thanks! 

-Christian

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Fossildude19
11 minutes ago, The Amateur Paleontologist said:

Thanks! 

-Christian

@The Amateur Paleontologist

Christian, can you re-upload the PDF?

Apparently moving it made it disappear. 

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The Amateur Paleontologist

@Fossildude19 Done ;)

-Christian 

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Fossildude19

Thanks, Christian. :) 

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DPS Ammonite

Thanks Christian and Tim; I can see the paper again.

 

Thanks to the powers that be for making this an open access paper; we need more of these.

 

“Journal of Paleontology, Volume 92, Memoir 77, 2018, p. 1–33
Copyright © 2018, The Paleontological Society. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/ licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.”

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