This 25 cm thick unit is calcareous with a platy structure and grades upwards into a greenish grey blocky mudstone with some organics.

This third unit encloses the upper portion of the sedimentary structure and bears a sharp, irregular contact with an overlying burrowed dark red claystone.

[2] The lower, bone-bearing portion consists of 25–30 cm of medium to fine, calcareous greenish-grey sandstone, moderately sorted with abundant plagioclase and other volcanogenic grains.

A thin, 1–2 cm thick, grey claystone separates this lower sand- stone from an upper fine sandstone.

A thin (less than 1 cm) rim of tan claystone with abundant calcite veins separates the lower portion of the structure from the host mudrocks.