Omagari carbonate lens, Nakagawa area, Hokkaido (Cretaceous of Japan)

Also known as Reef 3343

Where: Japan (44.7° N, 142.0° E: paleocoordinates 49.4° N, 130.6° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Omagari Formation (Yezo Group), Campanian (83.6 - 72.1 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified reef rocks and lithified lime mudstone

• Seep-related carbonate mound, 6 x 10 m, about 5 m thick. Carbonate breccia with abundant molluscs in the lower part. Worm-tube boundstone with 2 types of tubes in the upper part.

Size class: macrofossils

Primary reference: Y. Hikida, S. Suzuki, Y. Togo and A. Ijiri. 2003. An exceptionally well-preserved fossil seep community from the Cretaceous Yezo Group in the Nakagawa area, Hokkaido, northern Japan. Paleontological Research 7(4):329-342 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 74501: authorized by Wolfgang Kiessling, entered by Uta Merkel on 08.08.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Polychaeta
 Sabellida - Serpulidae
? Serpulidae indet.
? Serpulidae indet. Rafinesque 1835
Cephalopoda
 Ammonitida - Tetragonitidae
Gaudryceras tenuiliratum
Gaudryceras tenuiliratum Yabe 1903 ammonite
Gastropoda
 Trochoidea - Turbinidae
Margarites sp.
Margarites sp. Gray 1847 snail
 Patellida - Acmaeidae
Serradonta cf. vestimentifericola, Bathyacmaea cf. nipponica
Bivalvia
 Cardiida - Vesicomyidae
"Calyptogena sp." = Vesicomya (Calyptogena)
"Calyptogena sp." = Vesicomya (Calyptogena) Dall 1891 clam
 Lucinida - Thyasiridae
Thyasira sp.
Thyasira sp. Lamarck 1818 clam
 Lucinida - Lucinidae
Miltha sp., Nipponothracia cf. ponbetsensis
Miltha sp. Adams and Adams 1857 clam
Rhynchonellata
 Terebratulida - Terebratulidae
Terebratulidae indet.