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y <br />• <br />_J' <br />PLATE III. <br />.. ~_ .- ~. <br />': <br />i <br />-- - ----- <br />Portal area viewed from rocky ledge approx 250' <br />above impact area, showing excavated road leading <br />into portal, with heavy equipment on impact area, <br />ara r~~e.. Dr~,uor Dl ~..* ~,.A r_r~..A tuee~ in background. <br />PLATE IV. Overhanging rock above portal area, investigated <br />as suspect area with negative result. <br />-9- <br />