. Collected reprints, Essa Institute for Oceanography. Oceanography (TH mm m Tin in iiri'l IM tn Htxk K ^^_^^,T^/^\/7 7\_ / * A / ! v v A / P/ / -M7 / L \ \M;\ s P MILES. Fig. 3. A group of shatter cones from the Pertnjara formation showing orientation oblique to bedding. Fig. 4. Diagrammatic representation of shatter cone orientations at Gosses Bluff revealing the shock wave force Held which was impressed on the structure. A, Impact of bolide and radial spreading of shock wave instantaneously prior to upheaval. L, Larapinta group; M, Meerenie sandstone; P, Pertnjara formation. B
. Collected reprints, Essa Institute for Oceanography. Oceanography (TH mm m Tin in iiri'l IM tn Htxk K ^^_^^,T^/^\/7 7\_ / * A / ! v v A / P/ / -M7 / L \ \M;\ s P MILES. Fig. 3. A group of shatter cones from the Pertnjara formation showing orientation oblique to bedding. Fig. 4. Diagrammatic representation of shatter cone orientations at Gosses Bluff revealing the shock wave force Held which was impressed on the structure. A, Impact of bolide and radial spreading of shock wave instantaneously prior to upheaval. L, Larapinta group; M, Meerenie sandstone; P, Pertnjara formation. B, Presently observed orientation of shatter cones (arrows) in upturned strata. Vertical exaggeration. 2:1. If one can envision a return of the rocks to their presumed pre-event, essentially horizontal position, wo observe a pattern of shatter coning which reconstructs the shock wave force field which acted on the structure (Fig. 4). Before upheaval the shatter cones in the central region pointed directly skyward, those farther out pointed inward and upward, while those farthest out pointed radially inward. Because the apices of shatter cones point toward the impressed shock wave front, this indi- cates a shock originating from above as, most likely, the impact of a cosmic body with an apparent or effective diameter (that is, for purpose of impressing a parallel shock front) of about 7,000 ft. This derived diameter may well be beyond the limits of resolution of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute for Oceanography; Atlantic Oceanographic Laboratories (U. S. ); Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories. Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Labor
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