The fossiliferous rock now reported upon has been submitted to me by Mr. E. S. Willbourn, Director of the Geological Survey of the Federated Malay States, in the hope that examination of the fossils might lead to some definite conclusion as to the age of the coal-bearing strata with which it is associated. The locality is Durian Chondong, Kepong, in the Unfederated Malay State of Johore, and the material examined comprises a number of bore samples obtained from depths varying from 88 feet to 145 feet. These all consist of a grey marly shale containing numerous fossil shells, mainly more or less crushed, but sometimes well preservedand even retaining traces of their colour-ornamentation. The only other fossils obtained from the samples, beyond a few obscure plant impressions, are some small and indeterminate fish teeth.