Lower Turonian dark marls of Mafatma (Morocco)
The Mafatma Section is located at the Moroccan Atlantic coast
in the Tarfaya Basin. The Cenomanian-Turonian here is very organic-rich,
with TOC values often exceeding 5%. In the 1980s Shell studied the concept
of an open-pit oil shale mine. However, estimated production costs turned
out to be uncommercial, so the project was terminated. Today, the unit
is of interest for oil companies exploring for hydrocarbons in offshore
The Mafatma Section, located at the Atlantic Ocean in the Tarfaya Basin
Overview of section at low-tide. Possible methane chimney in the central
of the photograph.
Gamma-ray measurements in this section require patience, good stamina
Gamma measurements were carried out following pre-marked points with
of 10 cm. The standard duration of a measurement was 3 minutes. The
the background were cut by a rock-saw for high-resolution geochemical
Typical carbonate concretion in the black marls.