ammonites
Hn4100 - Miyako area [Tanohata Fm] (Cretaceous of Japan)

Also known as Hn4101

Where: Japan (39.8° N, 142.0° E: paleocoordinates 52.6° N, 141.8° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tanohata Formation, Late/Upper Aptian (122.5 - 112.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Hiraiga Fm. AGE: Late Aptian; justification for age not reported in text. STRATIGRAPHIC POSITION: From the basal part within the Tanohata Fm.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, shelly/skeletal, conglomeratic, calcareous sandstone

• SPECIFIC LITHOLOGY: Boulder-sized conglomerate, superposed upon basement rock of green-colored andesite; boulders mainly of round to subround andesite about 10 cm in diameter, but sometimes exceeding 2 ; matrix consists of conglomeratic and coquinal sandstone. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Collected by Hanai

• COLLECTOR: T. Hanai. REPOSITORY: Not stated in text.

Primary reference: T. Kase. 1984. Early Cretaceous marine and brackish-water Gastropoda from Japan 1-262 [A. Hendy/A. Hendy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 91305: authorized by Austin Hendy, entered by Austin Hendy on 14.09.2009

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)