When describing, two years ago, the Blake Collection of Ammonites 'from Kachh (Cutch), the writer (1924, p. 1) regretted that owing to the fact that he had not been able to re-examine "\Vaagcn's types, the affinitiefi of some of the oft-quoted Kachh species would have to remain 1mcertain· The kind offer, soon after, by Dr. E. H. Pascoc, the Director of the Geological Survey of India, to unde1take the revision of the Ammonite fauna of Kachh, was therefore eagerly accepted by the writer. l\lr. Oldham's anticiJlation of 1873 that Waagen's work would turn out to be one of the most important contributions to the Cephalopod palreontology of the Upper Jumssic formations ever issued, was completely realised, and the writer feels deeply grateful to Dr. Pascoe for entrusting him with the revision of so important a fauna.  <...>

This publication consists of tite revision of an abundant and well preserved flora. Thís flora was collected in the region known as El Consuelo, Iocated in the Mixteca Alta, State of Oaxaca, Mexico, and studíed by Wieland in 1914. The purpose of this revision was múltiple. From the observation of the material and the Illustrations of the monograph (Wieland, 1914-1916), it is evident that Wieland applied a stríct monotypic criterion.

How can we know about rivers that became extinct millions of years ago? The flowing water has gone. The channels and river plains have gone. Even the continents have gone. Only the river sediments of gravel, sand and mud remain, turned into rock as conglomerate, sandstone and mudstone through geological time. Prior to the observant eye of Leonardo da Vinci in the fifteenth century, the connection between soft sediment and solid rock was obscure.

For centuries mountains and rock sites were seen merely as almost insurmountable obstacles to development. Even though mines have been known for centuries, it is only a rather recent development to consider rock sites as being something more than a mere inconvenience, and to use them for practical purposes such as underground storage rooms, built-in hydro-power plants, etc.