Chert (/tʃɜːrt/) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide...
35 KB (4,217 words) - 14:36, 14 June 2024
57°20′12″N 002°50′29″W / 57.33667°N 2.84139°W / 57.33667; -2.84139 The Rhynie chert is a Lower Devonian sedimentary deposit exhibiting extraordinary fossil...
31 KB (3,509 words) - 12:12, 13 December 2023
New Harmony Group (redirect from Grassy Knob Chert)
is made up of three formations, the Grassy Knob Chert, the Backbone Limestone and Clear Creek Chert. It is Lower Devonian in age. Eastward the group...
3 KB (282 words) - 18:01, 7 March 2024
Pilbara Craton (redirect from Apex chert)
microorganisms permineralized in 3.465-billion-year-old Australian Apex chert rocks. However, the evidence for the biogenicity of these microstructures...
25 KB (2,079 words) - 16:07, 8 June 2024
The Princeton Chert is a fossil locality in British Columbia, Canada, which comprises an anatomically preserved flora of Eocene Epoch age, with rich species...
41 KB (3,584 words) - 04:45, 19 February 2024
The Huntersville Chert or Huntersville Formation is a Devonian geologic formation in the Appalachian region of the United States. It is primarily composed...
5 KB (454 words) - 17:11, 27 March 2024
Dresser Formation (section North Pole chert)
white chert. Facies 3, which overlies facies 2, consists largely of centimeter-layered chert. The layered chert consists of white-gray layered chert and...
22 KB (2,656 words) - 01:25, 8 December 2023
The Bigfork Chert is a Middle to Late Ordovician geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. First described in 1892, this...
3 KB (262 words) - 03:29, 15 February 2021
and William H. Lang in 1917. The species is known only from the Rhynie chert in Aberdeenshire, Scotland, where it grew in the vicinity of a silica-rich...
10 KB (1,032 words) - 21:58, 5 October 2022
Hunton Megagroup (redirect from Penters Chert)
Clifty Limestone is very sandy, light blue to bluish grey. The Penters Chert is a Devonian geologic formation in the Ozark Plateaus of Arkansas. Its...
14 KB (1,194 words) - 18:45, 25 April 2024