The purpose of this study has been the interpretation of the most probable structure producing the slightly subcircular anomaly at Crosbyton, as mapped by the pendulum, torsion balance, magnetometer, and dip needle. Work was begun in 1935 under the direction of Dr. Barton, who was to have written the geological considerations. All calculations were completed in 1938, but unfortunately the geological interpretation was not written by Dr. Barton before his death, July 8, 1939. At my request, since he had discussed the Crosbyton anomaly with Dr. Barton many times, and was quite familiar with the work we were doing, Mr. Weaver kindly consented to write the geological interpretation and help me with the completion of the paper. It is due to his knowledge and able assistance that the paper has been brought up to date in the light of subsequent drilling by the Gulf Oil Corporation.