Chesapeake Bay Crater. Montgomery College Planetarium at Takoma Park/Silver Spring By Dr. Harold Williams http://montgomerycollege.edu/Departments/planet/. Synopsis . 35.5 ± 0.6 million years ago, when Washington, DC and Richmond VA were on the coast, (sea level was higher then)
Montgomery College Planetarium
at Takoma Park/Silver Spring
By Dr. Harold Williams
Who did most of the real work and research.
Principal Investigator C. Wylie Poag firstname.lastname@example.org
Manicouagan, Quebec Canada,
70 km (43.4 miles) across,
Formed around 212 million years ago,
Lake surrounds the more erosion-resistant melt sheet created by the impact onto metamorphic and igneous rocks on the stable Canadian craton.
S-1 Large shocked quartz grains with planar deformation features (PDFs) identified in the Fraser Park, Sydney Basin Permian-Triassic boundary layer. Inset in upper photo shows close-up of intersecting PDFs. Quartz grains are mounted in oil and photographed in plane polarized light.