Where: Japan (39.1° N, 141.7° E: paleocoordinates 17.9° N, 108.3° E)
• coordinate stated in text
• outcrop-level geographic resolution
When: Sakamotosawa Formation, Sakmarian (293.5 - 290.1 Ma)
• 28 m above the base of the Sakamotozawa Formation
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified, medium-grained, brown, gray sandstone
Size class: macrofossils
Preservation: mold/impression
Collection methods: Repository: Niigata University
Primary reference: T. Shintani. 2011. Orthotetoids from the Lower Permian (Sakmarian) of the Nagaiwa-Sakamotozawa area, South Kitakami Belt, northeast Japan. Science Reports, Niigata University (Geology) 26:73-90 [M. Clapham/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 138382: authorized by Matthew Clapham, entered by Matthew Clapham on 16.01.2013
Creative Commons license: CC BY (attribution)
Taxonomic list
Strophomenata | |
Terrakea sp. Booker 1929 | |
Cyclacantharia sp. Cooper and Grant 1969 | |
Derbyia sakamotozawensis n. sp. Shintani 2011
Derbyia dorsosulcata Liu and Waterhouse 1985
Derbyia crassa Meek and Hayden 1858 | |
Meekella nagaiwensis Shintani 2011
Meekella striatocostata Cox 1857 |