Keep in mind that bedrock in this context is limestone and oolite. This rock is not an ideal foundation material. http://www.mgs.md.gov/geology/geohazards/eng

Keep in mind that bedrock in this context is limestone and oolite. This rock is not an ideal foundation material. http://www.mgs.md.gov/geology/geohazards/engineering_problems_in_karst.html http://www.mgs.md.gov/geology/geohazards/engineering_problem... Harder rock is deep, around 1,300m. (4,000ft). https://ufdc.ufl.edu/UF00000245/00001/20x https://ufdc.ufl.edu/UF00000245/00001/20x