Shatter cones at Sierra Madera, Texas
December 31, 1968
Shatter cones abound in the central uplift of Sierra Madera and they occur as far as 6.5 kilometers from the center. Apical angles average near 90 degrees. Whole cones and full cones represented by diversely oriented cone segments in any structural block show relatively uniform orientations of axes and a dominant direction of point. The cones predate faulting and folding in the central uplift, and, when beds are restored to horizontal, most cones point inward and upward, a pattern that supports the hypothesis of an impact origin.
Citation Information
Publication Year | 1968 |
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Title | Shatter cones at Sierra Madera, Texas |
DOI | 10.1126/science.162.3850.261 |
Authors | Keith A. Howard, Terry W. Offield |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Science |
Index ID | 70198168 |
Record Source | USGS Publications Warehouse |
USGS Organization | Geology, Minerals, Energy, and Geophysics Science Center |