Mark Wilson May 21st, 2010
GREENVILLE, ALABAMA — It is one of the most famous geological horizons. It marks the end of the Mesozoic Era and the beginning of the Cenozoic. The “K/T boundary” is dated at 65.5 million years ago (±0.3 my) and is found around the world. It is the primary datum for our work on this expedition, and we were led right to it by our friend Jon Bryan. We want to just pause a moment and enjoy the historical and stratigraphic significance of these sediments. (And yes, I know I should be calling this the more modern “Cretaceous-Paleogene Boundary” as Megan insists, but I grew up with “K/T” since my Berkeley graduate school days and it is hard to give up!)
More later from our hot and muggy day in southern Alabama!