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The numeric values on the International Chronostratigrahpic Chart are represented by the unit Ma (megaannum, for 'million years'). For example, 201.4 ± 0.2 Ma, the lower boundary of the Jurassic Period, is defined as 201,400,000 years old with an uncertainty of 200,000
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.
Illustrates the fossil range of a taxon, the geological range of a stratigraphic unit, or other ranges on a geological timescale. Intended for use in {{taxobox}}es, {{Infobox rockunit}} s, and other infoboxes. For pre-Phanerozoic ages, see {{Long fossil range}}. You can give a numeric range, or specify the periods involved.
Fossil material of a giant titanosaur sauropod, distinct from Andesaurus and probably exceeding Patagotitan in size, is described from the Cenomanian Candeleros Formation by Otero et al. (2021). [241] Revision of known fossil material of Pellegrinisaurus powelli and a study on the skeletal anatomy, bone histology and phylogenetic relationships ...
An early Campanian assemblage of anuran bones, suggestive of high local species richness of frogs, is described from the Aguja Formation (Texas, United States) by Wick (2021). [174] Fossil material of Late Cretaceous frogs, including fossils of calyptocephalellid frogs and the southernmost record of pipids (Kuruleufenia) worldwide reported to ...
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1808 — Cuvier and Alexandre Brongniart publish preliminary results of their survey of the geology of the Paris Basin that uses the fossils found in different strata to reconstruct the geologic history of the region. [11] 1811 — Mary Anning and her brother Joseph discover the fossilized remains of an Ichthyosaur at Lyme Regis.
The fossil record is very uneven and, with few exceptions, is heavily slanted toward organisms with hard parts, leaving most groups of soft-bodied organisms with little to no fossil record. [39] The groups considered to have a good fossil record, including a number of transitional fossils between traditional groups, are the vertebrates, the ...
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