North American was home to the Sundance Sea during this time; sediments of which are found below the sediments of the Morrison Formation.
The late Kimmerigian epoch of this period saw the onset of the marine crocodile genus Geosaurus while invertebrates that appeared during this time include the belemnites and reef-building mollusks known as rudists. North American was home to the Sundance Sea during this time; sediments of which are found below the sediments of the Morrison Formation. This middle of this period saw the placement of large batholiths in the northern Cordillera resulting in the Nevadan orogeny as well as the closing up of the Tethys Sea. Early ornithopods diversified into the stegosaurs during this time while large sauropods such as Brachiosaurus also became dominant. Named after a subrange of the Alps, FTP, identify this period of geological time; the second period of the Mesozoic Era which lies between the Triassic and Cretaceous.
The late Kimmerigian epoch of this period saw the onset of the marine crocodile genus Geosaurus while invertebrates that appeared during this time include the belemnites and reef-building mollusks known as rudists.
Jurassic Period