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Fossils from the Ordovician are commonplace in the geologic formations which make up the Cincinnati Arch and are commonly studied along man made roadcuts. The Nashville Dome of Tennessee and the Jessamine Dome or Lexington Dome [ 1 ] of central Kentucky make up the central portion of the arch.
The relatively dome shape of the holotype indicates the specimen was an adult or nearing its completion of its adult transition. Consolidation between flat headed and domed pachycephalosaurs have been greatly debated. Fossils records from more numerous North American specimen suggest a flat domed juvenile stages.
A dome is a feature in structural geology where a circular part of the Earth's surface has been pushed upward, tilting the pre-existing layers of earth away from the center. In technical terms, it consists of symmetrical anticlines that intersect each other at their respective apices .
Stegoceras is a genus of pachycephalosaurid (dome-headed) ... Pachycephalosaurs appear abruptly in the fossil record, and are present in both North America and Asia ...
Scientists discovered a 520-million-year-old fossilized larva with brains and guts intact, offering unprecedented insights into early arthropod evolution.
Due to the nature of the fossil record, however, it cannot be observed whether or not color played a role in dome function. Longrich, Sankey & Tanke (2010) argued that species recognition is an unlikely evolutionary cause for the dome, because dome forms are not notably different between species. Because of this general similarity, several ...
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.
Somatohelix is a genus of curvilinear, spiralling tubular fossil, 2–7 mm wide and 3–14 cm long, from the Ediacaran deposites of the South Australia that was originally interpreted as a trace fossil; a larger amount of better-preserved material since facilitated its reconstruction as the remains of an organism of uncertain nature. [1]