Petrographic analysis of this sample was conducted at the Havard-Smithsonian Center for Astrophysics and reported to 51st Meteoritical Society in 1988 by Ursula Marvin and David Kring.
12.
Later petrographic analysis of samples of the limestone from near the summit revealed them to be composed of carbonate pellets and finely fragmented remains of trilobites, crinoids, and ostracods.
13.
The red sandstone used in this site's structures has been determined by petrographic analysis to come from a quarry 10 kilometers away a remarkable distance considering that the largest of these stones weighs 131 metric tons.
14.
Commercial petrographic analysis of ceramics and other artefacts is offered by companies such as ceramicpetrology . co . uk in the UK, and Desert Archaeology [ http : / / www . desert . com in the USA.
