of FG (Jurassic) have Mississippi valley type (MVT) and Sedex type sulphide mineralization, in which Zn, Pb, Cu and barite are important.
This unit corresponds to the geomorphological unit of Alto Parnaiba Chapadoes, which is composed by sedimentary rocks
that are cut by a major system of fractures and are the valley elements.
While the pyroclastic volcanic igneous rock and the carbonate dominated Permian sedimentary rocks
are quartz-poor, almost void, the Triassic sedimentary rock
largely composed of sandstone is quartzrich.
. Density of sedimentary rocks
depends on the density of their compositional minerals, porosity, and the density of filling liquid and gas .
: Formed when layers of sediment are squeezed and cemented together.
Most of Earth's continents are made of granite, which over millions of years has been broken down, transported and deposited as sedimentary rock
. Under the crust's sedimentary and granite rock layers is a denser rock called basalt, which lies above Earth's thick, sedimentary mantle.
A mainstream theory suggests that 65 million years ago, pressures beneath the Earth's surface reached a climax, pushing through the ground with enough force to create the Rocky Mountains, the Black Hills, and a stream of molten magma that intruded into sedimentary rock
layers, thus forming this monument.
Thirty one real sedimentary rock
samples were taken from the Silesian Unit (Tesin-Hradiste Fm., Hradiste Lower Cretaceous, Lower Barremian) from the depth 170-230 m.
To the uninitiated, it is hard to imagine that flood geologists regard the Grand Canyon, with its thousands of feet of layers of sedimentary rock
deposited over the eons, as a suitable icon.
However, their bedding defects, or pseudo-morphological replacement phenomena, could have survived in the sedimentary rock
, yet no such phenomena were discovered.
The composite sequence of sedimentary rock
on the Earth, supposedly deposited by the Noachian Flood, approaches 100 miles thick.
One example of a sedimentary rock
that forms this way is sandstone.