Historical Review.

Of all the formations on the Pacific coast none have received greater attention than those which belong to the Cretaceous. The earliest extensive investigations in this field are published in the reports of the California Geological Survey, under the direction of Professor Whitney. Mr Gabb, of that survey, recognized four horizons in the Cretaceous, and the names given them by him are noted in the first column of the accompanying table. The Tejon,* Martinez and Chico were considered to belong to the Upper Cretaceous. All the Cretaceous below the Chico, composed of the beds exposed at Horsetown, on the north fork of Cottonwood creek, in Shasta county, and at a number of points in the Coast range, was grouped together under the name Shasta.

The investigations of Conrad, Jules Marcou and Heilprin have shown that the Téjon, instead of being Cretaceous, belongs to the Eocene.

In connection with . . .

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