 December 2014 Investor Presentation Exhibit 99.1 |
 Statements in this presentation that relate to forecasts, estimates or other expectations regarding future events, including without limitation, statements regarding the pending transaction, technological advancements and the companies’ financial position, business strategy and plans and objectives of management for future operations, may be deemed to be forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. When used in this presentation, words such as “anticipate,” “believe,” “estimate,” “expect,” “intend,” and similar expressions are intended to identify forward-looking statements. Such forward-looking statements are based on the beliefs of management as well as assumptions made by and information currently available to management. Actual results could differ materially from those contemplated by the forward-looking statements as a result of certain factors, including but not limited to the possibility that the transaction does not close when expected or at all because required shareholder or other approvals and other conditions to closing are not received or satisfied on a timely basis or at all; the risk that the benefits from the transaction may not be fully realized or may take longer to realize than expected; the ability to promptly and effectively integrate the businesses of Dawson and TGC; the reaction of the companies’ customers, employees and counterparties to the transaction; diversion of management time on transaction-related issues; the volatility of oil and natural gas prices; dependence upon energy industry spending; disruptions in the global economy; industry competition; reduced utilization; delays, reductions or cancellations of service contracts; high fixed costs of operations and high capital requirements; external factors affecting our crews such as weather interruptions and inability to obtain land access rights of way; the type of contracts we enter into; crew productivity; limited number of customers; credit risk related to the companies’ customers; the availability of capital resources and operational disruptions. A discussion of these and other factors, including risks and uncertainties with respect to Dawson is set forth in Dawson’s Form 10-K for the fiscal year ended September 30, 2013, and with respect to TGC, is set forth in TGC’s Form 10-K for the fiscal year ended December 31, 2013. Dawson and TGC disclaim any intention or obligation to revise any forward-looking statements, whether as a result of new information, future events or otherwise. Nasdaq: DWSN 2 |
 Important Information For Investors and Shareholders This presentation does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. The transactions contemplated by the merger agreement, including, with the respect to Dawson, the proposed merger and, with respect to TGC, the proposed issuance of TGC common stock in the merger and an amendment to TGC’s certificate of formation, will, as applicable, be submitted to the shareholders of Dawson and TGC for their consideration. On November 6, 2014, TGC filed with the Securities and Exchange Commission (SEC) a registration statement on Form S-4 that included a joint proxy statement of Dawson and TGC that also constitutes a prospectus of TGC. After the registration statement has been declared effective and subject to the terms of the merger agreement, Dawson and TGC will mail the joint proxy statement/prospectus to their respective shareholders. Dawson and TGC also plan to file other documents with the SEC regarding the proposed transaction. INVESTORS AND SECURITY HOLDERS OF DAWSON AND TGC ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS AND OTHER RELEVANT DOCUMENTS THAT WILL BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. Investors and shareholders may currently obtain free copies of the joint proxy statement/prospectus filed on November 6, 2014 and will be able to obtain free copies of any amendments to the joint proxy statement/prospectus and other documents containing important information about Dawson and TGC, once such documents are filed with the SEC, through the website maintained by the SEC at www.sec.gov. Dawson and TGC make available free of charge at www.dawson3d.com and www.tgcseismic.com, respectively (in the "Investor Relations" section), copies of materials they file with, or furnish to, the SEC, or investors and shareholders may contact Dawson at (432) 684-3000 or TGC at (972) 881- 1099 or c/o Dennard-Lascar Associates at (713) 529-6600 to receive copies of documents that each company files with or furnishes to the SEC. Participants in the Merger Solicitation Dawson, TGC, and certain of their respective directors and officers may be deemed to be participants in the solicitation of proxies from the shareholders of Dawson and TGC in connection with the proposed transactions. Information about the directors and officers of Dawson is set forth in its proxy statement for its 2014 annual meeting of shareholders, which was filed with the SEC on December 18, 2013, as well as subsequent periodic reports filed with the SEC. Information about the directors and officers of TGC is set forth in the joint proxy statement/prospectus. These documents can be obtained free of charge from the sources indicated above. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the joint proxy statement/prospectus and other relevant materials to be filed with the SEC when they become available. Nasdaq: DWSN 3 |
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 In business 62 years (founded 1952) Acquire and process seismic data for the accounts of our clients A leading provider of U.S. onshore seismic data acquisition services (2-D and 3-D) Canadian-based operations 10 crews operating 178,500 channels Diversified mix of oil and liquids-rich projects Primarily turnkey contracts Nasdaq: DWSN 5 Denver Midland Houston Pittsburgh Oklahoma City Calgary |
 62-year history enables Dawson Geophysical to navigate the cyclical nature of the business Investments in technology and equipment upgrades generate improved efficiencies Robust equipment base drives opportunities for growth and leads to improved contract terms Geographic diversity fosters opportunities in multiple basins Expertise in proprietary seismic solutions Fiscally conservative management team Nasdaq: DWSN 6 |
 Demand for Dawson Geophysical services remains steady despite project readiness issues Company deployed eight to twelve data acquisition crews in fiscal 2014 Order book sufficient to sustain deployment of nine to ten data acquisition crews into calendar year 2015 Balance sheet strength remains strong with approximately $73,777,000 of working capital and approximately $11,685,000 of debt Declared quarterly dividend of $0.08 per share in December 2014 2015 Capex anticipated to be at maintenance levels Announced early termination of HSR waiting period and filing of joint proxy statements/prospectus of Dawson Geophysical and TGC Industries Nasdaq: DWSN 7 |
 E&P company emphasis on exploration & developmental activities Seismic sector entering a new phase of growth with an increasing portfolio of both exploration and developmental services Continued emphasis on oil and liquids-rich projects with increasing growth opportunities in the natural gas Oil drives demand and creates opportunities for growth Permian, Delaware, Mississippi Lime activity creates new avenues of growth Demand for high-resolution images Increased channel count Enhances subsurface resolution Complex geological structures Helps reduce dry-hole risk and optimize production Advancements in technology Increased utilization of cableless recording equipment Nasdaq: DWSN 8 |
 Nasdaq: DWSN 9 Seismic data acquisition and processing is needed at all stages of the exploration and production process Map It Lease It Drill It CONVENTIONAL PROSPECTING Objective Shoot It IDENTIFY GEO-HAZARD Objective Lease It Map It Drill It Map It Drill It Repeat MAXIMIZE PRODUCTION Objective Shoot It Shoot It Exploration Evaluation Exploitation |
 Data Acquisition Design Permit Survey Field Operations Maintenance Support Functions Data Processing Midland, Houston, Oklahoma City In-field Services Nasdaq: DWSN 10 |
 Nasdaq: DWSN 11 10 Data Acquisition Crews Currently Spread Across Every Major Basin in the Continental United States |
 Nasdaq: DWSN 12 150,000 155,000 160,000 165,000 170,000 175,000 180,000 185,000 2011 2012 2013 2014 145 150 155 160 165 170 175 2011 2012 2013 2014 Channel Count Growth Energy Source Units Operating 10 Crews 3 ARAM ARIES Systems 6 GSR Systems 2,500 channels Wireless System RT2000 56,000 channels of GSR multi-channel boxes with 3-C geophones 48,000 single-channel GSR Units 9,000 three-component Geospace GSX3 Units Recording Channels 178,500 Vibrator Energy Source Units 149 energy source units 8 Envirovibe units Data Processing Services Houston Oklahoma City Midland |
 Reported revenues of $261,683,000 compared to $305,299,000 for the prior fiscal year EBITDA* for fiscal 2014 was $22,730,000 compared to $57,262,000 in fiscal 2013 Capital expenditures for fiscal 2014 were $34,073,000 compared to $50,069,000 in fiscal 2013 Balance sheet remains strong with $49,753,000 of cash and short-term investments, $73,777,000 of working capital and $11,685,000 of debt at September 30, 2014 On November 10, 2014 the Company's Board of Directors approved the payment on December 8, 2014 of an $0.08 per share quarterly cash dividend *For a definition of EBITDA and a reconciliation of EBITDA to our net income (loss), see Appendix A on Slides 24 and 25. Nasdaq: DWSN 13 |
 History of conservative financial management in a cyclical industry Low debt Well-positioned to respond to future client demand $20 million undrawn revolving line of credit available Nasdaq: DWSN Balance Sheet Data ($ in thousands) At 09/30/14 Working Capital $73,777 Net Property, Plant and Equipment $164,494 Total Assets $262,639 Debt $11,685 Stockholders’ Equity $199,530 14 |
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 Combined Company to Retain the Dawson Geophysical Name and Trading Symbol: DWSN Current Dawson and TGC Shareholders will own approximately 66% and 34% of the combined company respectively Continue Dawson and Eagle Canada as operating entities Structured as a stock-for-stock transaction that qualifies as a “reorganization” for tax purposes Closing is anticipated during the first calendar quarter of 2015 Requires 2/3 shareholder approval from both TGC and Dawson shareholders Board of Directors – 5 previous Dawson Board members and 3 previous TGC Board members Nasdaq: DWSN 16 |
 Structured as a stock-for-stock transaction Dawson will merge into a wholly-owned subsidiary of TGC and Dawson shareholders will receive shares of TGC common stock TGC will effect a 1-for-3 reverse stock split, which will reduce the number of outstanding TGC common shares from approximately 22 million to 7.3 million shares for transactional and charter purposes Dawson shareholders will receive 1.76 shares of TGC split-effected stock for every one share of Dawson stock TGC will issue approximately 14.2 million of split-effected shares in exchange for the approximately 8.1 million shares of Dawson stock outstanding Nasdaq: DWSN 17 |
 Expanded geographical presence Positioned to better serve clients through regional deployments Strengthened balance sheet Enhances operational and financial flexibility Enables company to respond more quickly to client needs & market conditions Compatible equipment bases Increases operational efficiencies and logistics Improves utilization rates and lowers costs Improved processes drives efficiencies Leads to lower expenses and increased revenue Reduce dependence on third party providers Expanded client base and order book Relieves pressure on utilization rates Nasdaq: DWSN 18 |
 Nasdaq: DWSN 19 Executive Management Team Dawson to Designate Four Additional Board Members TGC to Designate Two Additional Board Members Stephen C. Jumper – Chairman of the Board, President and Chief Executive Officer Wayne Whitener – Vice-Chairman and Officer Craig W. Cooper – Retired Geophysicist Gary M. Hoover, Ph.D – Retired Geophysicist Ted R. North – Certified Public Account Mark A. Vander Ploeg – Retired Investment Banker William J. Barrett – President of W.J. Barrett Associates, Inc. Allen T. McInnes, Ph.D – Emeritus Dean, Texas Tech University |
 Experienced management team and companies with more than 100 years combined existence Expanded equipment base and improved logistics designed to increase utilization and lower costs Combined client base and order book to relieve pressure on utilization rates Increased level of internal support services designed to reduce outsourcing Expanded channel count to shorten cycle times and provide higher resolution images Nasdaq: DWSN 20 |
 Full-service provider of data acquisition and data processing services First-Class Health, Safety & Environmental program Continued commitment to superior land survey and permitting services, improved IT support, expanded repair capabilities, trucking services, data processing, research and development and dynamite energy source drilling services Top rated platform of shared resources -- people, equipment and services -- that flows through to our clients, shareholders and employees Nasdaq: DWSN 21 Staying the Course |
 Current Stock Price: $15.57 (November 20, 2014) 52-Week Range: $15.25 - $34.90 Market Cap: $123.63 Million 3-Month Avg. Daily Volume: 70,471 Shares Outstanding: 7.96 Million Institutional Ownership: 80% Fiscal Year-end: September 30 Publicly-traded since 1981 Nasdaq: DWSN 22 |
 A leading U.S. land seismic data acquisition company from coast-to-coast. |
 Nasdaq: DWSN 24 Use of EBITDA (Non-GAAP measure) depreciation and amortization expense. Our management uses EBITDA as a supplemental financial measure to assess: the term EBITDA is not defined under generally accepted accounting principles (“GAAP”), and EBITDA is not a measure of operating income, operating performance or liquidity presented in accordance with GAAP. When assessing our operating performance or liquidity, investors and others should not consider this data in isolation or as a substitute for net income (loss), cash flow from operating activities or other cash flow data calculated in accordance with GAAP. In addition, our EBITDA may not be comparable to EBITDA or similarly titled measures utilized by other companies since such other companies may not calculate EBITDA in the same manner as us. Further, the results presented by EBITDA cannot be achieved without incurring the costs that the measure excludes: interest, taxes, depreciation and amortization. the financial performance of our assets without regard to financing methods, capital structures, taxes or historical cost basis; our liquidity and operating performance over time in relation to other companies that own similar assets and that we believe calculate EBITDA in a similar manner; and the ability of our assets to generate cash sufficient for us to pay potential interest costs. We also understand that such data are used by investors to assess our performance. However, We define EBITDA as net income (loss) plus interest expense, interest income, income taxes, • • • |
 Nasdaq: DWSN 25 Twelve Months Ended September 30, 2014 2013 (in thousands) Net income (loss) $ (12,620) 10,480 Depreciation 40,168 37,095 Interest expense (income), net 462 597 Income tax (benefit) expense (5,280) 9,090 EBITDA $ 22,730 $ 57,262 $ |
 26 NASDAQ: DWSN Nasdaq: DWSN |