Some clastic rocks are breccia, sandstone and shale . the rock can be coarse grained, fine grained medium, fien or very fine.
12.
Moving west from outcrops of early Devonian limestone, the Helderbergian limestones pinch out and the formation consists of clastic rocks that bear no caves.
13.
The sedimentary environment recorded near the end changed from deep water shales derived from Archean rocks to coarser clastic rocks derived from a younger Proterozoic source.
14.
The layer marks the end of a major period of banded-iron formation deposition that was succeeded by deposition of fine clastic rocks & ndash; commonly black shales.
15.
Recent research observed geochemical cyclicity in clastic rocks, showing that the " snowball " periods were punctuated by warm spells, similar to ice age cycles in recent Earth history.
16.
The mineralogy of a clastic rock is determined by the material supplied by the source area, the manner of its transport to the place of deposition and the stability of that particular mineral.
17.
The Gauja Formation is up to 183 metres thick and consists of quartz sand, multicolour clay, and fine-grained mellow clastic rocks, that has yielded remnants of fish and flora.
18.
In areas away from paleo-volcanic centers, thick sedimentary clastic rocks with sporadic limestone horizons and intercalated calcareous sediments, marls and / or coal seams were formed during the Miocene to Pliocene.
19.
In the southern coasts of Ulugan Bay and Sabang Beach, are several exposures showing that the Palawan ophiolite has been thrust on to the continent-derived clastic rocks ( " Sabang thrust " ).
20.
Jay B . Starkey Wilderness Park lies in the southwest portion of the Tampa Plain physiographic region with soils consisting of medium to fine sand over a base of limestone, shell and clastic rock deposits.
