 geologic processes mean that what was under the ocean is now on land right preserved in limestone used to construct many of dc's buildings remains like this can be unearthed all around the district if you know where to look speaking of chris tells me you know matt there are some pretty cool fossils not far from here in the national mall until next time in the district matt kofax wtop news and to see these fossils up close check out matt's video at wtop.com search matt about town