Gir Gypsum Tripolitania And Sirte Basin Fm
Period:
Paleogene
Age Interval:
Province:
Libya
Type Locality and Naming
Column: Tripolitania And Sirte Basin
Lithology and Thickness
Gir Gypsum Fm LITHOLOGY= Currently also known as the Al Jir Formation, there are many inconsistencies among geologists regarding this formation. Some areas of this formation have no gypsum present. Members: 1. The upper Bir Ziden limestone, which is now known as the Bi'r Zaydan Member quite often, is composed of white limestones and 2. the lower Bin Asa (also spelled Bin Isa) chalk, which is composed of hard chalk and chalky limestone that contains chert nodules and gypsum stringers. CALIBRATION = 50% Up in Ypresian. REFERENCE = Chart derived from: USGS Correlation Chart and Columnar Section for Rocks in Libya, 1963. Descriptions from: Hallet, Don: Petroleum Geology of Libya, 2002.
Lithology Pattern:
Chalk
Relationships and Distribution
Lower contact
Upper contact
Regional extent
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[19,30],[18,29],[19,28],[20,29],[19,30]]]]}}
Fossils
Age
Age Span:
Beginning stage:
Ypresian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
52.04
Ending stage:
Lutetian
Fraction up in the ending stage:
0
Ending date (Ma):
48.07
Depositional setting
Depositional pattern:
Additional Information
long: 19 lat: 29
Compiler: