|El Capitan Structure, Lincoln, New Mexico|
El Capitan Impact Structure, Lincoln, NM
Clastic Dike with giant clasts of Permian San Andres Limestone injected down into the Permian Yeso Formation.
The following photomicrographs are of sand grains in the Permian Yeso Formation collected adjacent to the clastic dike in the above photographs. The PM's fit the scale of Planar Deformation Features (PDF's) collected from porous and permeable sandstone that has never been buried deep enough to have been subjected to regional metamorphism The El Capitan Pluton is an igneous intrusion very similar in spatial relationship to the massive Sierra Blanco volcano as the Nacimiento Uplift is to the Jemez Caldera. In both cases I have collected samples of sandstone adjacent to the uplift or pluton that contain quartz grains with planar microstructures (PM's) that fit the scale of Planar Deformation Features (PDF's). At this point in my research the only evidence I have that the El Capitan Pluton is a central uplift of a large bolide impact crater are the Planar Microstructures (PM's) illustrated below. The geologic picture I have of the El Capitan Pluton also resembles the Iron Axis Laccoliths, which I believe I have more evidence that they are the central uplift of a large impact structure with pressures high enough to produce shocked quartz.