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 circular contains the following sections:
Introduction, excerpted: "...In the following pages is given a description of the samples from the [Texon Oil and Land Company B-1], in the Big Lake oil field, which is now [in 1928] the deepest well in the world.The description of samples published here [is from 3200] to 8525 ft. The well as indicated by the description of samples reveals a very great thickness of black shales and limes."

Texon Oil and Land Company B-1, located in the Big Lake oil field. Standard drilling, all samples are cuttings. Samples described by E. H. Sellards and O. M. Richey, submitted by Waldo Williams, Big Lake, 1928. [11 p.]

Walters 1, Texas Pacific Coal & Oil Co. Located on SE corner of Section 206, T. P. RR survey, BLk.1. Elevation 2721 ft. Description of samples by E. W. Berry, submitted by R. A. Thompson. Most of the samples are cuttings. [6 p.]
Note on p. 17 from J. A. Udden, July 1924: "The rock at 3120 feet is not at all like the single sample I have seen from the oil producing horizon, in Santa Rita No. 1."