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[name given to a piece of petrified wood found in the Aachenian deposits near Moresnet, Belgium, and misidentified in 1888 as part of a duckbill dinosaur’s jaw.]
[a genus of ammonoids in the order Ammonitida and family Cardioceratidae. Generally about 4 inches in diameter and 2 inches wide at the aperture, it was involute and sub-globular. Holarctic distribution, Middle Jurassic.]
[an extant genus of conifer trees in the family Podocarpaceae. Australia and New Zealand, Eocene to Recent.]
[a site of importance to the paleontology of Romer’s gap. A former limestone quarry, it has yielded since the 1980s skeletal fossils of tetrapods and other Carboniferous animals such as the temnospondyl Balanerpeton. See also Silvanerpeton. Scotland, Early Carboniferous, 435 Ma.]
[the principal family of plants in the order Fabales. The most prominent subfamilies are the Papilionoideae and Mimosoideae, important for their role in fixing atmospheric nitrogen in concert with symbiotic bacteria such as the Rhizobiales. The earliest-known fossil specimens have been found in...
[a class or subclass of jawless fish, similar in shape to the heterostracans but more closely related to the osteostracans. They are notable for a flattened, one-piece bony headshield, with an opening of various shapes and sizes on the headshield. Some bore striking slender processes projecting...
[a monospecific genus of marine snakes in the suborder Serpentes and family Simoliophiidae. About 3 feet long, H. terrasanctus is especially notable for still having hindlimbs, including partial feet. Known from an almost complete skeleton, it figures prominently in the ongoing debate about the...
[a species of denticulate conodont elements in the order Proconodontida and family Cordylodontidae. Its first appearance (currently considered to be 485.4 Ma) marks the GSSP for the beginning of the Early Ordovician in Newfoundland, Canada. The species is also known from the United States,...
[a genus of giant eurypterids in the family Pterygotidae. Estimated at 7–8 feet long but known only from partial remains, it may be the largest arthropod known. The type species is J. rhenaniae (Germany) and the other reported species is J. howelli (Wyoming). Germany and the United States, Early...
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