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Showing results for tags 'late creteaceous'.
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Hi! I'm a new user who's really into marine reptile bones, by which I mean mosasaurs and plesiosaurs from the Late Cretaceous strata found where I live. I've recently found a small yet satisfying piece that seems to be a hollow bone of a pterosaur/bird. The age of the strata is Late Campanian/Early Mastrichtian and the rock itself is an erratic piece of an "opoka" - a siliceous limestone typically found in Poland and Germany. The bedrock from which it originates lies very likely underneath the Quarternary cover in what is now the Gdańsk Bay (SE Baltic Sea region). It's hollow inside and when v
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Unusual Hell Creek Formation fossilized tooth record
Joseph Fossil posted a topic in Questions & Answers
I've recently found a, how do I say...quite unusual Theropod dinosaur tooth from the Late Cretaceous Hell Creek Formation (67-66.0 Million Years ago). The paper, titled The occurrences of vertebrate fossils in the Deadhorse Coulee Member of the Milk River Formation and their implications for provincialism and evolution in the Santonian (Late Cretaceous) of North America by Derek Williams Larson, is a record of theropod teeth from various Late Cretaceous formations in Western North America, and buried on page 244 of the report an apparent megalosauridae tooth (UCMP120305) from the Hell Creek Fo -
Giant Dromaeosaurs and other Eumaniraptora from the Cretaceous period
Joseph Fossil posted a topic in Questions & Answers
The Eumaniraptora is a clade of non-avian theropod dinosaurs that first emerged during the late Jurassic period and diversified extensively during the subsequent Cretaceous period (143-66 Million years ago). This group is most famously known as the Raptor dinosaurs (the sister clade of the theropod dinosaurs that gave direct rise to the birds), consisting of mostly small to mid sized theropod dinosaurs. There are a few species though that exceed the typical small-medium size range for the raptor dinosaurs. Only a few giant raptor dinosaurs are currently known. But recent discoveries over the p- 2 replies
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- dromaeosaurs
- non-avian to avian
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The two most prominent hypothesizes on the direct evolutionary origin of perhaps the most famous Theropod Dinosaur from the fossil record, Tyrannosaurus Rex (Tyrannosauridae, Late Cretaceous (68-66 Million Years ago)) are what I call the Laramidia and Asian Origins. The Laramidia origin (named after the region of the Western North America which was a separate Continent during most of the Late Cretaceous and home to a vast amount of dinosaurs including Tyrannosaurus rex) hypothesizes that Tyrannosaurus rex is the direct descendent of and evolved from slightly older North American T
