Search results
Results from the WOW.Com Content Network
The Precambrian fossil record is poorer than that of the succeeding Phanerozoic, and fossils from the Precambrian (e.g. stromatolites) are of limited biostratigraphic use. [4] This is because many Precambrian rocks have been heavily metamorphosed , obscuring their origins, while others have been destroyed by erosion, or remain deeply buried ...
The Burgess Shale is a series of sediment deposits spread over a vertical distance of hundreds of metres, extending laterally for at least 50 kilometres (30 mi). [18] The deposits were originally laid down on the floor of a shallow sea; during the Late Cretaceous Laramide orogeny, mountain-building processes squeezed the sediments upwards to their current position at around 2,500 metres (8,000 ...
Charnia fossils were originally found in the Charnwood Forest in England, hence named Charnia. [8] These fossils are from marine organisms that lived on the bottom of the ocean floor. The fossils have a fractal body plan and were frond shaped, meaning they resembled broad-leafed plants such as ferns. However they could not have been plants ...
The Cambrian explosion (also known as Cambrian radiation [1] or Cambrian diversification) is an interval of time beginning approximately in the Cambrian period of the early Paleozoic, when a sudden radiation of complex life occurred and practically all major animal phyla started appearing in the fossil record.
Fossil of the Early Cretaceous-Eocene shark Cretolamna †Cretolamna †Cretolamna appendiculata †Cretorectolobus †Cretorectolobus olsoni – or unidentified comparable form †Crosbysaurus – type locality for genus †Crosbysaurus harrisae – type locality for species; Cucullaea †Cucullaea capax †Cucullaea powersi; Cuspidaria ...
Prehistoric crustaceans Cambrian · Ordovician · Silurian · Devonian · Carboniferous · Permian · Triassic · Jurassic · Cretaceous · Paleocene · Eocene · Oligocene · Miocene See also: Category:Extinct crustaceans
Anomalocaris fossils were first collected in 1886 [8] by Richard G. McConnell of the Geological Survey of Canada (GSC). Having been informed of rich fossils at the Stephen Formation in British Columbia, McConnell climbed Mount Stephen on 13 September 1886. [12] [13] He found abundant trilobites, along with two unknown specimens. [7]
Prior to 1958, the Precambrian was thought to be completely devoid of fossils and consequently possibly devoid of macroscopic life. Similar fossils had been found during the 1930s (in Namibia) and the 1940s (in Australia) but these forms were assumed to be of Cambrian age and were therefore considered unremarkable at the time.