Hiraiga Fm Hn 4153 - Moshi: Late/Upper Aptian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Carditida - Astartidae
Astarte (Nicaniella) semicostata
Astarte (Freiastarte) subomalioides
Bivalvia - Cardiida - Veneridae
Nagaoella corrugata
Bivalvia - Nuculanida - Nuculanidae
Mesosaccella insignis
Crinoidea - Isocrinida - Isocrinidae
Isocrinus (Chladocrinus) hanaii n. sp.
see common names

Geography
Country:Japan State/province:Iwate
Coordinates: 39.8° North, 142.0° East (view map)
Paleocoordinates:53.0° North, 141.0° East
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
10 m.y. bin:Cretaceous 2-3
Key time interval:Late/Upper Aptian
Age range of interval:119.50000 - 113.00000 m.y. ago
Stratigraphy
Geological group:Miyako Formation:Hiraiga
Stratigraphic resolution:bed
Stratigraphy comments: Miyako group extends from Aptian - Albian. This collection comes from one of the uppermost Aptian formations in the group. This zone is reported to occur ~24-27 m above the base of the Hiraiga Fm.
Lithology and environment
Primary lithology:"cross stratification",fine lithified calcareous sandstone
Lithology description: calcareous, fine-grained, well washed (clean) sandstone with large scale cross stratification
Environment:foreshore
Geology comments: reported to be from high-energy, nearshore shallow water env. with clean, cross bedded sandstone. Most crinoid fossils are heavily disarticulated with rare, event derived articulated preservation
Taphonomy
Modes of preservation:body,original calcite
Size of fossils:macrofossils
Preservation of anatomical detail:variable
Abundance in sediment:common
Articulated whole bodies:some
Disassociated major elements:many
Disassociated minor elements:many
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Taxonomic list comments:specimens appear to be stored at University Museum, University of Tokyo
Metadata
Database number:65647
Authorizer:A. Miller Enterer:C. Ferguson
Research group:marine invertebrate
Created:2006-09-23 18:12:28 Last modified:2006-09-23 21:12:28
Access level:the public Released:2006-09-23 18:12:26
Creative Commons license:CC BY
Reference information

Primary reference:
18878. T. Oji. 1985. Early Cretaceous Isocrinus from Northeast Japan. Palaeontology 28(4):629-642 [A. Miller/C. Ferguson]