 Geologic processes mean that what was under the ocean is now on land, right? Preserved in limestone used to construct many of D.C.'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 Koufax, WTOP News. And to see these fossils up close, check out WTOP.com. Search Matt About Town.