TY4-2, Gevar'am 2 Well (Cretaceous to of Israel)

Where: Southern Coastal Plain, Israel (31.6° N, 34.6° E)

• Paleocoordinates: 14.9° N, 40.7° E (Wright 2013)

• coordinate based on nearby landmark

When: Talme Yafe Formation, Late/Upper Albian to Late/Upper Albian (106.3 - 93.9 Ma)

Environment/lithology: marine; lithified, gray, argillaceous, carbonaceous mudstone

• The Gevar'a m Formation occurs in the lower part of the Cretaceous sequences that was studied. It unconformably overlies limestone beds considered to be of Jurassic age (Derin, 1966). In the Gevar'am 2 well the formation consists of 942 meters of dark gray, carbonaceous, marine shales with occasional thin sandstone beds. To the east there is a rapid facies change and in the Helez area most of the marine shales grade laterally into shallow water arenaceous sediments (Shenhav, 1970), which are referred to as the Helez Formation. Correlation between the less argillaceous sediments of the Helez Formation and the shales of the Gevar'am Formation has not, as yet, been established paleontologically.

•In the Gevar'am 2 well, at 1500 m the Gevar'am Fm. is overlain by 700 meters of light to medium gray marine mudstone called the Talme Yafe Formation. The nature of the contact between these two formations is still an open question.

•The rapid vertical change from a carbonaceous shale to a light gray marlstone sequence may represent an unconformable relationship or only a rapid change in the depositional environment.

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collection methods: chemical, hydrochloric, hydroflouric, sieve

Primary reference: G. J. Brenner. 1974. Palynostratigraphy of the Lower Cretaceus Gevar'am and Talme Yafe Formations in the Gevar'am well (Southern Coastal Plain, Israel). Bulletin of the Geological Survey of Israel 59:1-27 [C. Jaramillo/G. Doria/A. Cardenas ]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 144145: authorized by Carlos Jaramillo, entered by Gabriela Doria on 01.05.2013

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Baltisphareidium "sp. 1", Hytrichophaeridium ancoriterum, Hytrichosphaera ramosa, Gonyoulucysta "sp. 1", Hystrichokolpomo ferox
 Dinoflagellata -
Polysphaeridium "sp. 1"
Polysphaeridium "sp. 1" Davey and Williams 1966
Dinophyceae
 Gonyaulacales - Gonyaulacaceae
Chytroeisphaeridia sp.
Chytroeisphaeridia sp. Downie et al. 1963
 Gonyaulacales - Goniodomaceae
Hystrichosphaeridium mantelli, Hystrichosphaeridium "sp. 2"
 Gonyaulacales -
Tanyosphaeridium sp.
Tanyosphaeridium sp. Davey and Williams 1966
Dinoflagellata
 Hystrichosphaeridea -
Hystrichosphaera cingulata
Retitricolpites
  -
Retitricolpites sp.
Retitricolpites sp. Van der Hammen 1956
Angiospermae
 Malpighiales - Euphorbiaceae
Tricolporopollenites sp.
Tricolporopollenites sp. Thomson and Pflug 1953 spurge
 Life -
Baltisphaeridium "sp. 2"
Baltisphaeridium "sp. 2" Eisenack 1958 acritarchs