Ankozany, Sakamena sediments of the Majunga Basin, Madagascar Early Triassic (Triassic to of Madagascar)

Where: Madagascar (14.6° S, 48.2° E: paleocoordinates 45.2° S, 39.9° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Dienerian to Dienerian (252.2 - 247.2 Ma)

• Stage: Nammalian = Induan = Olenekian = Smithian = Dienerian

• group-level stratigraphic resolution

Environment/lithology: lagoonal; black, gray, sandy shale

• From Early Permian times onwards, continental sedimentation was repeatedly influenced or interrupted by marine ingressions documented by the presence of brackish water horizons and shallow marine deposits.

•The lower and middle part of the Sakamena section is a black argillaceous shale which contains nodules and a few thin sandstone beds. Above an unexposed interval a grey sandy shale occurs immediately below the Isalo sandstone.

•Deposition of the Sakamena shale occurred probably in a lagoonal or tidal flat environment.

Size class: microfossils

Collection methods: chemical, mechanical,

Primary reference: O. Hankel. 1993. Early Triassic plant microfossils from Sakamena sediments of the Majunga Basin, Madagascar. Review of Palaeobotany and Palynology 77:213-233 [C. Looy/W. Puijk/W. Puijk]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 31351: authorized by Cindy Looy, entered by Wilma Puijk on 08.05.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Leiosphaeridia
  -
Leiosphaeridia spp. Eisenack 1958
 Eukaryota -
Veryhachium sp. Deunff 1954 acritarchs
Equisetopsida
 Cupressales - Pinidae
Densosporites
  -
Densosporites sp. Berry 1937
Peltacystia
  -
Peltacystia sp. Balme and Segroves
Lycopodiopsida
 Selaginellales - Selaginellaceae
Perotrilites sp. Couper 1953 spikemoss
 Selaginellales -
Alisporites
  -
Alisporites spp. Daugherty 1941
Brevitriletes
  -
Algae
  - Zygnemataceae
Tetraporina sp. Naumova 1950
Protohaploxypinus
  -
Protohaploxypinus spp. Samoilovitch 1953
Fimbriaesporites
  -
Lycopsida
  -
Pteridopsida
  -
Polypodiopsida
 Gleicheniales - Polypodiidae
Dictyophyllidites mortonii Playford and Dettmann 1965
Punctatisporites
  -
Cycadopites
  -
Cycadopites follicularis Wilson and Webster 1946
 Coniferales - Podocarpaceae
Platysaccus spp. Naumova 1954 podocarp
Pinopsida
 Pinales - Taxaceae
Striatopodocarpites spp. Sedova 1956 yew
Bryopsida
  -
Lunatisporites
  -
Schizosporis
  -
Schizosporis spp. Cookson and Dettmann 1959
 Life -
Aratrisporites spp. Leschik 1956