Author: Chase

Preprint Published: Theropod Specimens from the Navesink Formation

Hi there everyone. I just wanted to note that my preprint on ornithomimosaur and tyrannosauroid hindlimb elements from the Maastrichtian Navesink Formation of Monmouth County, New Jersey, has been published. Recently, the taxon “Teihevenator” was erected by Yun (2017)(it’s a nomen nudum because the Zoobank LSID for the name wasn’t included in the paper and the paper doesn’t seem to publish copies)(for more discussion of this see my preprint on a tyrannosauroid from the Merchantville Formation of Delaware(1) and this post at the Theropod Database Blog). I was also working on these specimens during the time Yun (2017) was published describing AMNH 2550-2553 as a new genus, with myself describing them as a chimaera of ornithomimosaur and tyrannosauroid remains. As such, upon hearing of the publication of Yun (2017), I finished up my figures of the specimens and submitted it for publication as a preprint, which you can find here. I love hearing from all of you, so please don’t hesitate to leave comments on this post or on the preprint itself regarding the manuscript!

Thanks again for reading!

 

Refs-

Yun C. 2017. Teihivenator gen. nov., a new generic name for the tyrannosauroid dinosaur “Laelaps” macropus (Cope, 1868; preoccupied by Koch, 1836). Journal of Zoological and Bioscience Research 4(2):7-13.

 

Footnotes-

(1) The metatarsals II and IV are from Delaware. Though I only named the state of discovery of these specimens twice incorrectly in the manuscript, I made an error and for some odd reason thought the specimens were found several miles east of Summit Bridge. This error has been corrected in my working copy of the manuscript and I have addressed it by adding an erratum in the comments section of the manuscript.

 

 

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Preprint Published: A Tyrannosauroid Metatarsus from the Merchantville Formation of Delaware increases the diversity of non-Tyrannosaurid Tyrannosauroids on Appalachia

Hello everyone. Recently, I have worked on describing several tyrannosaur specimens from the Cretaceous Formations of Atlantic Coastal Plain. One of the manuscripts I have written concerns a partial tyrannosaur metatarsus from the Merchantville Formation of Delaware. As of now, the preprint of this paper has been published, and you can find it here:

https://peerj.com/preprints/3097/

The metatarsus represents a distinct morphotype of tyrannosaur from Dryptosaurus or Appalachiosaurus, but nevertheless is too incomplete and lacking in distinguishing features to warrant the naming of a new specimen. Certainly, the diversity of tyrannosauroids on Appalachia has been underestimated.

 

An Interesting Encounter at Lunch: Chelydra serpentina

Hi everyone! This will be a short post, but one regarding an interesting sighting I had while having lunch at a local diner today. The diner, known aptly as the Lakeside Diner (info), sits on a lake that is frequented by many bird species. Besides the common grackle, blue jay, and house sparrows I saw today, another denizen of the water made an appearance. As a brown rat was getting ready to head back into the water, a large beak made a splash as it grabbed the poor rodent and dragged it into the lake. It was none other than the maw of a common snapping turtle, Chelydra serpentina.

This turtle, covered in knobs and scales, was around three or so feet in length. It was quite the lake resident. As it plunged back into the murky water, I was able to get some photos of its rugged back and tail. Here they are:

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It goes to show that even in the suburban setting of Stamford, Connecticut, truly incredible species may be found.

PaleoNews #22: Appalachian ceratopsians and more!

Hello and welcome to this shorter edition of PaleoNews. This spring, a few finds related to the landmass of Appalachia have been published on, and so here’s a look back at those.

NEW FINDINGS

Though the find was published on by the media this past summer (e.g., here), the first-ever record of a ceratopsid dinosaur from Appalachia has been published on in the journal PeerJ. In the paper “The first reported ceratopsid dinosaur from eastern North America (Owl Creek Formation, Upper Cretaceous, Mississippi, USA)” (Farke and Phillips, 2017), the discovery of a single tooth from the Maastrichtian Owl Creek Formation is discussed in the context of the biogeography of horned dinosaurs in North America during the Cretaceous. The paper also discusses the Maastrichtian-age deposit that is the Owl Creek Formation and its fauna in some detail, as well as giving a brief overview of the dinosaur clades which inhabited the landmass of Appalachia (Farke and Phillips, 2017).

In the paper, the authors conclude that a dispersal event of ceratopsid dinosaurs occurred in North America as the Western Interior Seaway retreated during the Maastrichtian, the last stage of the Cretaceous period (Farke and Phillips, 2017). Thus, the tooth is both significant for being the first report of a ceratopsid dinosaur from eastern North America as well as for suggesting a possible dispersal event during the Maastrichtian.

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The MS find belonged to the ceratopsidae, as did Triceratops horridus (skull pictured above). 

I also had an article published on ornithomimosaur remains from the Arundel Clay of Maryland (Brownstein, 2017). The finds I describe are important for representing two distinct morphotypes (and thus possibly two distinct species) of ornithomimosaur that existed in the Arundel ecosystem. These dinosaurs would have coexisted with the titanosauriform sauropod Astrodon, the dromaeosaur Deinonychus, the carcharodontosaur Acrocanthosaurus, possibly the ornithopod Tenontosaurus, an indeterminate neoceratopsian, and the obscure nodosaurid Priconodon (e.g. Weishampel, 2006). There is certainly much more material to be published on from the Arundel Clay, so it should be exciting to see how the Arundel’s dinosaurs come to light.

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Two of the pedal unguals representing one of the morphotypes of ornithomimosaur present in the Arundel. 

FEATURED FOSSIL 

Today, I feature the skull of the Aurochs (Bos primigenius), an extinct species of large bovine that inhabited the wilds of Europe, northern Africa, and Asia during the Pleistocene and into the Holocene. Julius Caesar, in book 6 of his Commentarii de Bello Gallico, writes on the fantastic size and power of these animals (Commentarii de Bello Gallico 6.28). I highly recommend you read his description, either in translation or the original latin, if you haven’t already, as it gives a seldom-attained glimpse of an extinct animal of a great awe-inspiring nature.

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Overall, this has been a productive spring for Appalachian discoveries. Let’s hope for an even better summer! Thanks for reading.

References

Farke, A.A., and Phillips, G.E. 2017. The first reported ceratopsid dinosaur from eastern North America (Owl Creek Formation, Upper Cretaceous, Mississippi, USA. PeerJ, 5:e3342. 

Brownstein, C.D. 2017. Description of Arundel Clay ornithomimosaur material and a reinterpretation of Nedcolbertia justinhofmanni as an “Ostrich Dinosaur”: biogeographic implicationsPeerJ, 5:e3110. 

Weishampel, D.B. 2006. Another look at the dinosaurs of the East Coast of North America, p. 129-168. In ‘Coletivo Arqueológico-Paleontológico Salense, (eds.), Actas III Jornadas Dinosaurios Entorno. Salas de los Infantes, Burgos, Spain.

 

Earth Day 2017: A Call to be Active in Conservation and Environmentalism

Ever since the end of 2016, I’ve been obsessively scrolling around the planet on Google Earth in my spare time. I’ve realized that I’m not doing this because I’m worried about what we might lose in the future, but because I’m nervous of what we have already lost today. Perhaps this notion of mine is because of my work and interest in paleontology. I’m liable to be looking to the past, not the present. Our current crisis, however, is too close for comfort for me, even in looking at it with a purely scientific perspective.

Late in the afternoon today, I took a hike in the Mianus River Gorge Preserve (their website is here), a beautiful stretch of land in New York that preserves an old growth forest of Hemlock trees that was not logged and turned into farmland due to taking up residence on the steep slopes of the gorge. This preserve was actually the first of the Nature Conservancy’s preserves and the first National Natural History Landmark in the United States , and walking through the gorge and old growth forest gave me a minute or two to think about conservation in general.

The land of the preserve bears scars from when humans exploited the countryside for its land, with the difference between the old-growth forest and the secondary growth forest growing above collapsed stone walls stark. Deforestation leaves its scars. As I read about the sudden uptick in deforestation in the Amazon rainforest, the old rock walls which populate the forest floor around myself come to mind.

In previous years, I’ve written articles on this blog on Earth day in celebration. I’m not so sure I can today. Science and the environment are under heavy attack from powerful forces political and economic. It’s up to everyone to stand up for the planet, as many demonstrated today by marching at the March for Science and its sister marches across the globe. Though I couldn’t join them today, I’ve been for my part trying to contact my legislators as much as possible regarding conservation and other issues and donating to conservation organizations among others when I can. Yet the scariness of the moment doesn’t cease. All I can say is that I think it’s going to be a long few years ahead for science and conservation, but with a little luck and a lot of work things will turn out all right. Happy Earth Day.

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Rocky Mountain National Park, Colorado. Photo by the author. 

 

 

A New Theory on the Apex Predators of Appalachia

Hello everyone!  I’d like to share with you some recent developments regarding the study of dinosaurs from the eastern United States. Some new exciting research by Gotya et al. (2017) suggests that the apex predators of the continent were neither tyrannosauroids like Dryptosaurus aquilunguis nor huge crocodyliform taxa like Deinosuchus rugosus. 

Gotya et al. (2017) suggest, contrary to previous research, that Appalachia was in fact the home of large relatives of the pitcher plant genus Sarracenia. These plants, named Lythrophytum giganticum (“giant gore plant”), are thought by Gotya et al. (2017) to have grown in large groves, with each plant’s mouth heavily widened to ingest large prey. Through molecular studies of the fossils of this large pitcher plant, Gotya et al. (2017) concluded that the L. giganticum emitted a sweet smell to draw in medium-sized herbivorous dinosaurs and other large herbivores. Then, the action of the herbivores biting the flower would cause the plant to release a highly toxic substance that would paralyze the herbivore. Then, with the herbivore immobilized, the heat of the herbivore’s body would cause each of the flowers of the L. giganticum plants to turn towards the plant’s paralyzed prey, excreting an acidic solution to dissolve the body. Once dissolved, the nutrients of the herbivore would be absorbed by the plants. I have illustrated the proposed process below for better clarity.

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Completely Accurate Restoration. 

I’m very interested to see how work on these giant Mesozoic plants progresses into the future. For more information, click on the link to the paper below:

Gotya HA, Aprille FO, Ferst OLS. 2017. New fossils from the Late Cretaceous of the eastern United States provide evidence for carnivorous plants being the apex predators of Appalachia, or something. Journal of Creepy Creatures 24: 114-122.

Article: Description of Arundel Clay ornithomimosaur material and a reinterpretation of Nedcolbertia justinhofmanni as an “Ostrich Dinosaur”: biogeographic implications

Hi there everyone! My article on ornithomimosaur remains from the Arundel Formation of Maryland was published today at the journal PeerJ. If you have time and are interested in Cretaceous dinosaurs from eastern North America, please check it out here. That’s all for now.

P.S. I have been very busy with several things lately, but I hope to write a few new blog posts in the coming weeks. Thanks again for reading.