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Restoration of Batrachotomus, a Middle Triassic rauisuchian from Germany.This genus is known from abundant fossil material and belongs to the clade Loricata Hip joint and hindlimb postures of (1) "sprawling" amniotes (lizards and crocodilians) (2) "erect" amniotes (mammals and dinosaurs), and (3) "pillar-erect" amniotes ("rauisuchians" and aetosaurs) The hip of Prestosuchus (AMNH 3856)
Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. Another term, "zone fossil", is used when the fossil has all the characters stated above except wide geographical distribution; thus, they correlate the surrounding rock to a biozone rather than a specific time period.
The generic name is derived from a crasis compound word from the Latin parva ancora (small anchor).. The specific name of the type species, P. minchami, honors Mr. H. Mincham, the private collector, who in 1957 had collected and presented a number of fine specimens of Ediacaran fossils to the South Australian Museum.
There is a layer of enamel and even a layer of pulp. The whole shield is made up of thousands of small teeth fused together. This bony skull--one of the earliest in the fossil record--is made entirely of little teeth. Teeth originally arose to bite creatures (see Conodonts); later a version of teeth was used in a new way to protect them." [4]
Fossil collectors contributed to finding the jawbone of a giant ichthyosaur new to science that’s likely the largest known marine reptile to swim Earth’s seas.
The Green River Formation is a geological formation located in the Intermountain West of the United States, in the states of Colorado, Utah, and Wyoming.It comprises sediments deposited during the Early Eocene in a series of large freshwater lakes: Lake Gosiute, Lake Uinta, and Fossil Lake (the last containing Fossil Butte National Monument).
Tribrachidium fossils were first discovered in the Ediacara Member of the Rawnslay Quartzite, Flinders Ranges in South Australia. [3] [4] This fossil is also known from the Mogilev Formation in the Dniester River Basin, Podolia, Ukraine [5] and from the Verkhovka, Zimnegory and Yorga formations in the White Sea area of the Arkhangelsk Region, Russia.
Archimedes is a genus of fenestrate bryozoans with a calcified skeleton of a delicate spiral-shaped mesh that was thickened near the axis into a massive corkscrew-shaped central structure.