Study of morphotype groups of plankton Icforamonifera in Gurpi Formation at Sabze kuh area (Borujen)

Category Paleontology and Stratigraphy
Group GSI.IR
Location 20th symposium on geosciences
Holding Date 16 April 2008

     Based on study of planktonic foraminifera of the Gurpi Formation in thin sections, three Morphotype groups is recognised. Each group was adapted to a speacial depth of water column. The morphotype groups are charachterised by:
First group is index for shallow waters and has biserial or tochospiral tests with globular chambers and little ornamentation Second group with bioconvex trochospiral tests and true keels or trochospiral tests with globular but heavily ornamentated chambers indicatesintermediate waters.
Thired group is charachtersed by keeledplano-convex trochospiral tests and is index for deep waters.
This study shows an overall regression through the GurpiFormation