Top of Martin Ridge North section (Ordovician of the United States)

Where: Eureka County, Nevada (39.2° N, 116.4° W: paleocoordinates 5.9° S, 80.1° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Histiodella sinuosa - Histiodella holodentata conodont zone, Antelope Valley Formation (Pogonip Group), Whiterockian (470.0 - 457.3 Ma)

• Anomalorthis Zone, Kanoshian, middle Whiterockian

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; dolomitic, peloidal lime mudstone and dolomitic, peloidal wackestone

Size classes: macrofossils, mesofossils

Preservation: replaced with silica

Collection methods: quarrying,

Primary reference: A. G. Harris, S. M. Bergström, R. L. Ethington and R. J. Ross. 1979. Aspects of Middle and Upper Ordovician Conodont Biostratigraphy of Carbonate Facies in Nevada and Southeast California and Comparison with Some Appalachian Successions. Brigham Young University Geology Studies 26(3):7-44 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 210657: authorized by Pete Wagner, entered by Pete Wagner on 11.06.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Conodonta
  -
Conodonta "n. gen." Pander 1856 conodont
Conodonta "simple cone indet." Pander 1856 conodont
 Panderodontida - Panderodontidae
Panderodus spp. Ethington 1959 conodont
 Ozarkodinida -
Periodon sp. Hadding 1913 conodont
  -
 Prioniodontida - Acodontidae
""Acontiodus" nevadensis" = Acodus
""Acontiodus" nevadensis" = Acodus conodont
 Prioniodontida -
Erraticodon sp. Dzik 1978 conodont
 Prioniodontida - Polyplacognathidae
"Polyplacognathus friendsvillensis" = Cahabagnathus friendsvillensis, Polyplacognathus rutriformis
"Polyplacognathus friendsvillensis" = Cahabagnathus friendsvillensis Bergström 1971 conodont
 Prioniodontida -
Phragmodus flexuosus Moskalenko 1973 conodont
 Prioniodontida - Pygodontidae
Pygodus serra Hadding 1913 conodont
 Belodellida - Belodellidae
Belodella "n. sp." Ethington 1959 conodont
 Belodellida - Ansellidae
"Belodella nevadensis" = Ansella nevadensis
"Belodella nevadensis" = Ansella nevadensis Ethington and Schumacher 1969 conodont