Where: Yukon, Canada (65.0° N, 136.0° W: paleocoordinates 9.0° N, 47.5° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Road River Formation, Ludlow (427.4 - 423.0 Ma)
• Ludvigsen and Tripp state that age could be earliest Pridoli; their assignment is based on overlying graptolites. Thomas and Lane give age as ?Upper Ludlow.
• bed-level stratigraphic resolution
Environment/lithology: deep subtidal shelf; carbonate
•SEP: it is clear from the description here that the environment represented by these rocks is a slope or basinal facies. However, the sampled community clearly comes from the outer margin of the platform. Because this is a paleobiological database, I have provided the likely LIFE environment of the assemblage, not the PRESERVATIONAL setting. I have errored on the side of deeper facies
Collection methods: Text includes total counts and percent abundances.
Primary reference: A. T. Thomas and P. D. Lane. 1999. Trilobite assemblages of the North Atlantic Region. in A. J. Boucot and J. D. Lawson, eds. Paleocommunities--a case study from the Silurian and Lower Devonian. Cambridge University Press, Cambrdige 444-457. [M. Foote/M. Foote/M. Foote]more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 23078: authorized by Michael Foote, entered by Michael Foote on 09.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Conodonta | |
"Ligonodina elegans" = Oulodus elegans
"Ligonodina elegans" = Oulodus elegans Walliser 1964 conodont | |
"Neoprioniodus multiformis" = Idioprioniodus, "Neoprioniodus sp." = Idioprioniodus
| |
Synprioniodina silurica, "Neoprioniodus bicurvatus" = Synprioniodina bicurvata
Synprioniodina silurica conodont
"Neoprioniodus bicurvatus" = Synprioniodina bicurvata Branson and Mehl 1933 conodont [entered as Neopriooidus bicurvatus]
| |
Panderodus spp. Ethington 1959 conodont | |
Spathognathodus primus, Ozarkodina media, Hindeodella equidentata, "Plectospathodus sp." = Ozarkodina
Spathognathodus primus Branson and Mehl 1933 conodont
Ozarkodina media Walliser 1957 conodont
Hindeodella equidentata Rhodes 1953 conodont
"Plectospathodus sp." = Ozarkodina Branson and Mehl 1933 conodont | |
Spathognathodus sp. Branson and Mehl 1941 conodont | |
Strophomenata | |
Rhynchonellata | |
? Anastrophia sp. Hall 1867 | |
Gypidula sp. Hall 1867 | |
Delthyris sp. Dalman 1828 | |
? Meristina sp. Hall 1867 | |
"? Rhynchospira sp." = Rhynchospirina
"? Rhynchospira sp." = Rhynchospirina Schuchert and LeVene 1929 | |
Salopina sp. Boucot 1960 | |
? Dolerorthis sp. Schuchert and Cooper 1931 | |
Trilobita | |
Paracybantyx asulcatus n. gen. n. sp., Planiscutellum sp.
Paracybantyx asulcatus n. gen. n. sp. trilobite
Planiscutellum sp. Richter 1956 trilobite genus name in quotes; given by ref. 6640 as "Indeterminate scutelluine"
| |
Proetidae indet., Prantlia vagrans n. sp., Hedstroemia kutchini n. sp., Hedstroemia sourdoughi n. sp.
Proetidae indet. Salter 1864 trilobite
Prantlia vagrans n. sp. Ludvigsen and Tripp 1990 trilobite
Hedstroemia kutchini n. sp. Ludvigsen and Tripp 1990 trilobite
Hedstroemia sourdoughi n. sp. Ludvigsen and Tripp 1990 trilobite | |
Encrinurinae indet. Angelin 1854 trilobite
Balizoma aff. obtusus trilobite | |
Lichidae indet. Hawle and Corda 1847 trilobite |