A major reason for the lack of understanding of argillaceous rocks is that the key to understanding their history lies in their microfabric. Argillaceous Rock A

Provides a very clear guide to sedimentary rock types as seen under the microscope supported by practical aspects of slide preparation.

In May 1976 Lucian B. Platt organized a highly successful Penrose Confer ence on The Formation of Rock Cleavage at Bryn Mawr College in Penn sylvania, U. S. A.

'Hurray for Mackenzie and Guilford for at last we have a pictorial guide to the rock-forming minerals! . . . such feasts of colour in mineralogy books are rare

This concise volume is designed for the introductory undergraduate level. With the help of colour photographs, the authors explain how to observe, describe and