| Squatirhina | |
|---|---|
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Genus: | †Squatirhina |
Squatirhina is a genus of Late Cretaceous cartilaginous fish whose fossils have been found in the Aguja and Pen Formations of Big Bend National Park, Texas, USA. [1]
The Javelina Formation is a geological formation in Texas. Dating has shown that the strata date to the Maastrichtian stage of the Late Cretaceous, approximately 70 to 66.5 million years old. The middle part of the formation has been dated to about 69 million years ago plus or minus 1 Ma and the top situated near the Cretaceous–Paleogene boundary, dated to 66 Ma ago. Dinosaur remains are among the fossils that have been recovered from the formation.
The Black Peaks Formation is a geological formation in Texas whose strata date back to the Late Cretaceous. Dinosaur remains have been among the fossils reported from the formation. The boundary with the underlying Javelina Formation has been estimated at about 66.5 million years old. The formation preserves the rays Rhombodus and Dasyatis, as well as many gar scales.
The Gardener's Clay Formation is a Pleistocene geologic unit straddling the New York-New Jersey border. Fossil fish vertebrae and teeth are preserved in its sediments.
The Boquillas Formation is a geologic formation deposited during the Late Cretaceous in modern-day West Texas. It is typically composed of alternating marls and limestones with thin volcanic ash beds (bentonites). It was named for outcrops near the former Boquillas post office in Big Bend National Park. The term Boquillas Formation has been used for rocks that outcrop from Del Rio, Texas to as far west as Doña Ana County, New Mexico.
The Hannold Hill Formation is an Early Eocene (Wasatchian) geologic unit in the western United States. It preserves the fossilized remains of the ray Myliobatis and gar.
The Culpeper Basin is one of the Newark Supergroup's Triassic rift basins. It frames the eastern front of the Appalachian Mountains From Culpeper County, Virginia into Maryland. The Groveton Member of the Bull Run Formation is exposed there. The formations has produced disarticulated fish remains including isolated bones and scales.
The Pen Formation is a Campanian-age geologic unit in the western United States.
The Doughnut Formation is an Upper Mississippian geologic unit in the western United States. Fish fossils have been discovered in shale outcrops of this formation in Dinosaur National Monument.
The Shedhorn Sandstone is a Permian geologic unit in the western United States. Fish fossils were first discovered by Harry Nazer in its rocks.
The Brushy Canyon Formation is a Permian geologic unit in Guadalupe Mountains National Park. The formation contains fan sandstones that were deposited under ancient seawater during the Middle Permian. These rocks contain abundant fish fossils like sharks' teeth preserved within small phosphatic nodules.
The Cabrillo Formation is a Maastrichtian stage geologic formation in coastal San Diego County, southern California. It is part of the Rosario Group.
The Kishenehn Formation is a Paleogene stratigraphic unit in Montana. Fossil amiiforme and teleost fish have been found in outcrops of the formation's Coal Creek Member in Glacier National Park. Mosquitos have also been found in the Coal Creek Member, and have been found to be hematophagous. It is considered a Middle Eocene Lagerstätte.
The Cliff House Sandstone is a late Campanian stratigraphic unit comprising sandstones in the western United States.
The Glenns Ferry Formation is a Pliocene stratigraphic unit in the western United States. Outcrops of the formation in Hagerman Fossil Beds National Monument preserve the remains of seven fish species, five of which are extinct. These include the teleosteans Mylopharodon hagermanensis, Sigmopharyngodon idahoensis, and Ptychocheilus oregonensis, Ameirurus vespertinus, and the sunfish Archoplites taylori. A nearly complete skull of the catfish Ameirurus vespertinus was recovered in 2001 from the wall of the Smithsonian Horse Quarry.
The Hidden Valley Dolomite is a Silurian−Devonian geologic formation in the northern Mojave Desert of California, in the western United States.
Blieckaspis priscillae is a pteraspidid heterostracan agnathan from the Middle Devonian of North America.
Myledaphus is a genus of Late Cretaceous cartilaginous fish whose fossils are known from Canada, the Midwest of the United States, Olmos Formation of the Difunta Group of Mexico, and the Beshtyubin and Bissekty Formations of Uzbekistan. It was a freshwater guitarfish that probably reached a length of 3 feet (91 cm), and had teeth adapted for a durophagous diet of animals such as clams. Most taxonomic authories place the genus in the Rhinobatidae, with a few placing it with prehistoric sharks (Anacoracidae), although the latter may be incorrect. Two species are known: Myledaphus bipartitus, the type species, and Myledaphus araucanus, named in 2019.
Ochopristis is a genus of Late Cretaceous cartilaginous fish whose fossils have been found in the Aguja and Pen Formations of Big Bend National Park, Texas, USA.
Burrow fossils are the remains of burrows - holes or tunnels excavated into the ground or seafloor - by animals to create a space suitable for habitation, temporary refuge, or as a byproduct of locomotion preserved in the rock record. Because burrow fossils represent the preserved byproducts of behavior rather than physical remains, they are considered a kind of trace fossil. One common kind of burrow fossil is known as Skolithos, and the similar Trypanites, Ophiomorpha and Diplocraterion.
ReBecca Hunt-Foster is an American paleontologist. She has worked with dinosaur remains from the Late Jurassic to Late Cretaceous of the Colorado Plateau, Rocky Mountains, Southcentral, and the Southwestern United States of America. She described the dinosaur Arkansaurus fridayi and identified the first juvenile Torosaurus occurrences from Big Bend National Park in North America in 2008.
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