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Scylla posted a topic in Fossil NewsI remember seeing Trackways in the Cocconino Sandstone as a kid in the Grand Canyon. These are not the ones I've seen before. Almost 100 years after the first paper out of the Grand Canyon is one describing an icnotaxa unexpected in the Permian desert. https://phys.org/news/2019-05-newly-fossil-footprints-paleontologists-rethink.amp
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. 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 Paleontology, 92(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
So in late June early July my wife, 2 boys (8 & 2.5), my father in-law and mother-in-law and I are going to take a 2 week road trip around the US. We'll be leaving Maryland and heading down to Memphis, Tennessee followed by Nashville then on to Texas and ending up in Albuquerque, New Mexico at my brother-in-law's for a few days, then off to the Grand Canyon, up to Dinosaur National monument, over to Hot Springs, South Dakota to the Mammoth site, Mt Rushmore, and Crazy Horse Monument, then to the Badlands in South Dakota, and then start making our way back to home. We're taking some new paths and going back over some previous ones. I am interested in doing 1-2 hour fossil and/or rock and mineral collecting leg stretches not terribly far off US 40 between Memphis and Albuquerque. Honestly anywhere else near the places I listed and anywhere along US 90 back to Chicago and down to Indianapolis, then US 70 the rest of the way east towards home. I'm hoping if I ask on here I can get a handful of options for the trip, we may only do two or three depending on time, weather and general feedback from the rest of the family. I have messaged PFooley about the Albuquerque/Rio Puerco area. After we get back I will have to make a write up of the adventure, it should be a great trip full of geologic and paleontological fun. Thanks for any information, Adam