Ankirihitra, unit 1a: Early/Lower Callovian, Madagascar

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Cephalopoda - Ammonitida - Macrocephalitidae
Pleurocephalites habyensis
Macrocephalites formosus
Macrocephalites madagascariensis
Cephalopoda - Ammonitida - Perisphinctidae
Siemiradzkia demariae
Choffatia homoeomorpha
Bivalvia - Mytilida - Mytilidae
Modiolus plicatus Sowerby 1819
recombined as Mytilus (Pharomytilus) plicatus
Bivalvia - Ostreida - Palaeolophidae
Alectryonia gregarea (Sowerby 1816)
recombined as Actinostreon gregareum
see common names

Geography
Country:Madagascar
Coordinates: 16.8° South, 46.5° East (view map)
Paleocoordinates:24.4° South, 24.2° East
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Jurassic Epoch:Middle Jurassic
Stage:Callovian 10 m.y. bin:Jurassic 5
Key time interval:Early/Lower Callovian
Age range of interval:164.70000 - 161.20000 m.y. ago
Stratigraphy
Local section:Ankirihitra Local bed:1a
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: Macrocephalites triangularis zone
Lithology and environment
Primary lithology: lithified "limestone"
Secondary lithology: lithified argillaceous "limestone"
Lithology description: limestones and marly limestones with thin intercalations of marl
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:98128
Authorizer:W. Kiessling Enterer:U. Merkel
Research group:marine invertebrate
Created:2010-09-21 04:34:04 Last modified:2010-09-21 07:34:04
Access level:the public Released:2010-09-21 04:34:04
Creative Commons license:CC BY
Reference information

Primary reference:

8015.PGAP 1022H. Besairie and M. Collignon. 1972. Geologie de Madagascar I. Les Terrains Sedimentaires. Annales Geologiques de Madagascar 35:1-463 [A. Rees/A. Rees]