The basin started to accumulate sediments in the Early Cretaceous ( Neocomian ) .
At present basin has sedimentary deposits reaching thicknesses of 5,000 metres ( 16,000 ft ) .
The basin started to accumulate sediments in the Early Cretaceous ( Neocomian ) and at present it has sedimentary deposits reaching thicknesses of 5,000 metres ( 16,000 ft ) .