These circulars issued from the Bureau of Economic Geology contain the record of cores and cuttings from well received and described in the Bureau. In some instances, driller's logs and other data are given, although it is usually impracticable to include logs of all wells, the logs given being selected as representative of the county or area to which the circular relates. The elevations given are for the most part those reported with the driller's log. In some instances the elevation given, as indicated, is that obtained from the location of the well on the topographic map. In all cases the elevation is to be regarded as approximate only.---E. H. Sellards

This document consists of the following short sections:

Well of Chisos Mining Company, samples described by J. A. Udden; submitted by Chisos Mining Company, 1917.

Gage 1, Marathon Oil Company, samples described by J. A. Udden; submitted by J. E. Thomas. Undated.

Hargus 1, Alexander Syndicate, samples described by J.E. B. Stiles; submitted by G. M. Kerr. 1920.

Kokernot 1, Twin City Oil and Gas Company and Arco Development Company;samples described by J. A. Udden, E. H. Sellards, E. B. Stiles, H. T. Kniker, P. T. Seashore, and A. H. Kemp; submitted by M. J. Smith, 1921.

Portland Syndicate Well, samples described by J. A. Udden; submitted by J. H. Ritchie. 1921.

Skinner 1, Alexander Syndicate, samples described by H. T. Kniker; submitted by D. D. Cosley. 1920.

Wilson 1, Presidio Oil Company, samples described by J. A. Udden; submitted by W. T. Thaxton, 1924.

Wilson 2, Presidio Oil Company, samples described by E. B. Stiles and P. T. Seashore, submitted by W. B. Harris. 6 p., 1921.

Yarbro 1, Alexander Syndicate, samples described by H. T. Kniker, submitted by D. D. Coaley, 1920.