Where: Millard County, Utah (38.7° N, 114.0° W: paleocoordinates 2.7° N, 43.0° W)
• coordinate estimated from map
• local area-level geographic resolution
When: Chesterian to Chesterian (339.4 - 318.1 Ma)
• The upper chert-bearing units of the Joana Limestone forms the lower contact. For field mapping purposes, the intention has been to draw the upper boundary just above the uppermost shale units, at the base of red weathering sandy limestones of the Illipah Formation.
Environment/lithology: gray, carbonaceous shale and black, gray limestone
Primary reference: W. J. Gould. 1959. Geology of the Northern Needle Range Millard County, Utah. Brigham Young University Research Studies, Geology Series 6(5):1-47 [T. Olszewski/M. Gibson/L. Fall]more details
PaleoDB collection 13362: authorized by Tom Olszewski, entered by Melissa Gibson on 10.03.2002, edited by Pete Wagner
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Cephalopoda | |
Cravenoceras sp. Bisat 1928 ammonite | |
Gastropoda | |
Bellerophontoidea indet. M'Coy 1851 snail | |
Strophomenata | |
Derbyia sp. Waagen 1884 | |
"Chonetes granulifer" = Neochonetes granulifer
"Chonetes granulifer" = Neochonetes granulifer Owen 1852 | |
"Dictyoclostus americanus" = Reticulatia americana, Dictyoclostus burlingtonensis, Dictyoclostus inflatus
"Dictyoclostus americanus" = Reticulatia americana Dunbar and Condra 1932
Dictyoclostus burlingtonensis Hall 1858
Dictyoclostus inflatus McChesney 1860 | |
"Dictyoclostus portlockianus" = Antiquatonia portlockianus
"Dictyoclostus portlockianus" = Antiquatonia portlockianus Norwood and Pratten 1855 | |
Linoproductus ovatus Hall 1858 | |
Stenolaemata | |
Fenestella sp. Lonsdale 1839 | |
Rhombopora sp. Meek 1872 | |
Trilobita | |
Phillipsia sp. Portlock 1843 trilobite |