Kitching, J. W.2014-12-222014-12-221963-08-01None0078-8554http://hdl.handle.net/10539/16068Main articleMost palaeontological field workers are familiar with the blue to green shales and maroon to red mudstones, as well as the fine-grained greenish-blue sandstones, of the Cynognathus-zone, all these colours contributing to its general patchy appearance. Heights within the zone can unfortunately not be determined reliably with the assistance of particular colour sequences, but a conspicuous and persistent sandstone horizon marks the middle level of the zone. Our knowledge of the manner in which fossils occur both above and below this horizon is not satisfactory.enFossil pockets; bone beds; Cynognathus zoneArticle