Dawson Geophysical Company, formerly TGC Industries, Inc., is a provider of seismic data acquisition services throughout the United States and Canada. As of December 31, 2014, the Company operated eight seismic crews consisting of three crews in the United States and five crews in Canada. These seismic crews supply seismic data primarily to companies engaged in the exploration and development of oil and natural gas on land and in land-to-water transition areas. Seismic acquisition services of its wholly owned subsidiary, Eagle Canada, Inc. (Eagle Canada) are also used by the potash mining industry in Canada, and Eagle Canada is engaged in heliportable activities. It acquires geophysical data using three-dimensional (3-D) survey techniques. The Company provides its seismic data acquisition services primarily to onshore oil and natural gas exploration and development companies for use in the onshore drilling and production of oil and natural gas in the United States and Canada.