and that the obtained age can be admitted as the actual data of the latest fault movement.Meanwhile, ESR dates of quartz vein and fault clay in other localities (locations 3, 6, 7) are divided into 0.30-0.55 Ma and 1.5 -2.0 Ma, which suggest incomplete resetting.These can be subdivided based on the percentages of Quartz, Feldspar, and unstable lithic fragments (fragments of preexisting rock). In a feldspathic wacke, feldspar is more abundant, and in a lithic wacke, lithic fragments are more abundant.
L.)and Minobu Fault in the western South Fossa Magna have been obtained by ESR dating.
The dates of 0.30-0.55 and 1.5-2.0 Ma might correspond to the clino- unconformities observed in Plio-Pleistocene sequence of this region.
The Pyrenean Axial Zone is characterized by thick series of metasedimentary and orthogneissic materials derived from pre-Variscan rocks.
Sandstones Sandstones make up only about 25% of the stratigraphic record, but have received the most attention in studies of sedimentary rocks. First, sandstones are easily studied because they contain sand sized grains that can easily be distinguished with a petrographic microscope.
Second, most of the world's oil and natural gas is found in sands or sandstones because of their generally high porosity.
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