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Groenlandaspis is unusual among placoderms in that it is known what color it was; preserved pigment cells in its fossils indicate that its posterior was red and its anterior was silvery-white in a countershaded pattern, camouflaging it in the murky, silty waters of the rivers in which it dwelled. [11]
The oldest fossils of the group are from the mid Cretaceous. [4] ... or yellow coloring pattern. [7] ... Adults are 6-21mm long.
The roughly 22 species are placed in 6 genera (with two additional genera known only as fossils). Dryomyzid flies are found principally in the Holarctic, though some are found in the Southern Hemisphere. Very little is known of the habits of the adults or immatures, but adults are found in moist, shady habits among low-growing vegetation. [1]
Numerous fossil Hemerobiidae have been described, some from the still-living genera, others from genera that are entirely extinct today. While most have been found in Eocene to Miocene rocks or amber , Promegalomus is known from the Jurassic .
A fossil from the Cherokee Ranch petrified forest. A large petrified forest thought to date to the Paleocene at around 55 million years old is located on and around the grounds of Cherokee Ranch in Douglas County, Colorado. These Denver Basin fossils include plants similar to the modern laurel tree family. At least 40 large petrified logs have ...
The Smoky Hill Chalk Member of the Niobrara Chalk formation is a Cretaceous conservation Lagerstätte, or fossil rich geological formation, known primarily for its exceptionally well-preserved marine reptiles. [2] Named for the Smoky Hill River, [1] the Smoky Hill Chalk Member is the uppermost of the two structural units of the Niobrara Chalk. [2]
There are also undescribed fossils from southwestern Ecuador, but apart from these forms, teratorns were restricted to North America. [6] A closely related genus, Aiolornis, was about 40% larger and lived at an earlier time; it was formerly known as Teratornis incredibilis, but is distinct enough to be placed in its own genus.
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