Slide 16 of 50

Earth astroblemes counted in Cenozoic, Mesozoic, Paleozoic, and Precambrian rock strata. 121 data points from geologist Richard Grieve of Canada (evolutionist and well known for his research on Earth impact sites). Note that there is much more Mesozoic and Cenozoic strata near the surface on the continents than there is precambrian rock. Data from Geological Survey of Canada, 1998; from Canadian Geological Survey Web site: http://gdcinfo.agg.emr.ca/crater/world_craters.html