limestones

Thus in soluble rocks, such as limestones, joints enlarged by percolating water are sometimes filled with metalliferous deposits, as, for example, the lead and zinc deposits of the upper Mississippi valley.

The Elements of Geology William Harmon Norton 1900

The Company is also investigating the application of other geophysical tools including seismic techniques to further define the coal seam and the paleo-surface of the underlying Devonian limestones which is believed to be one of the controlling factors in the deposition of the coal.

Marketwire - Breaking News Releases 2008

The Naica Hills are comprised of 97 million year old (Early Cretaceous) limestones.

Did you know? Chihuahua caves house the world's largest crystals 2009

The Naica Hills are comprised of 97 million year old (Early Cretaceous) limestones.

Did you know? Chihuahua caves house the world's largest crystals 2009

The Naica Hills are comprised of 97 million year old (Early Cretaceous) limestones.

Did you know? Chihuahua caves house the world's largest crystals 2009

Just make sure the rocks are not organic shales or limestones, as these too were derived from living organisms.

Hath Not a Plant Life? 2010

It also marks another big step in the takeover of geochemical processes by living things: most Phanerozoic limestones are made of biological debris.

Who Do You Say I Am 2010

Just make sure the rocks are not organic shales or limestones, as these too were derived from living organisms.

Hath Not a Plant Life? 2010

Just make sure the rocks are not organic shales or limestones, as these too were derived from living organisms.

Hath Not a Plant Life? 2010

The area is underlain by extensive Pleistocene limestones with oolitic and bryozoan facies, overlaid by variable thicknesses of marl and peat, a thin porous crust which filters the surface water percolating to the aquifer.

Everglades National Park, United States 2009