Sandstone - Department of Geology UPRM
... B- Positively skewed; the coarser half of the population shows better sorting than the finer half, so both the median and the mean are shifted toward finer grain size. C- negatively skewed finer half is better sorted than the coarser and the median and the mean are shifted toward coarser grain size. ...
... B- Positively skewed; the coarser half of the population shows better sorting than the finer half, so both the median and the mean are shifted toward finer grain size. C- negatively skewed finer half is better sorted than the coarser and the median and the mean are shifted toward coarser grain size. ...
Problems in the use of the Salamanca sandstone in historic
... The Villamayor sandstone (the Cabrerizos Sandstone lithofacies of fluvial origin) has been classified as an arkosic-feldspathic sandstone, with quartz (40-70%), feldspars (10-30%), micas and a clay-rich matrix. Tourmaline is locally present. Petrographic studies show the homometric and subrounded gr ...
... The Villamayor sandstone (the Cabrerizos Sandstone lithofacies of fluvial origin) has been classified as an arkosic-feldspathic sandstone, with quartz (40-70%), feldspars (10-30%), micas and a clay-rich matrix. Tourmaline is locally present. Petrographic studies show the homometric and subrounded gr ...
Jacobsville Sandstone
Jacobsville Sandstone is a red sandstone formation, marked with light-colored streaks and spots, primarily found in northern Upper Michigan, portions of Ontario, and under much of Lake Superior. Desired for its durability and aesthetics, the sandstone was used as an architectural building stone both locally and around the United States. The stone was extracted by thirty-two quarries throughout the Upper Peninsula approximately between 1870 and 1915.The sandstone has been variously called redstone, brownstone, Lake Superior Sandstone, and Eastern Sandstone. In 1907, the Jacobsville Formation was given its current classification and the name Jacobsville, in honor of Jacobsville, Michigan, a town known for its production of the sandstone. There is disagreement regarding the age of the sandstone, though it dates to sometime between the Mesoproterozoic Era and the Middle Cambrian. The formation is of terrestrial origin and is entirely devoid of fossils.