Sentences with phrase «rocks deposited over»

Not exact matches

Depending on shifting cave conditions and varying amounts of uranium drainage from mineral deposits, this method can over - or underestimate when rock art was created, the scientists argued.

The rocks of the Karoo, deposited over a very long period from 300 - 180 million years ago, are internationally renowned for their wealth of fossils, particularly of therapsid reptiles which are the distant ancestors of mammals.

Sedimentary rocks consist of layers of materials that are deposited over time.

Porous rock forms in the absence of material, and it can give birth to mineral deposits over millennia.

Over time, the sea level dropped enough to expose a shelf where large chunks of limestone rock were deposited.

[4] The alluvial deposits from these rivers are generally a few hundred feet (30 metres) thick and lie over Pleistocene and Pliocene sedimentary rocks.

Eventually, over hundreds of millennia, weathering of rocks will deposit all of this initial CO2 pulse on the ocean floor as carbonate sediments [168].