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The aquifer beds overlie, and are partially recharged by the Dakota Aquifer and certain Permian aquifers. These particular High Plains Aquifers are also known sources of widespread natural salt contamination, including portions of the Equus Beds, which can be aggravated by human extraction of water as well as by salt mining and oil wells .
Beds of lava flows exposed on the island of La Gomera. Bed thickness is a basic and important characteristic of beds. Besides mapping stratigraphic units and interpreting sedimentary facies, the analysis of bed thickness can be used to recognize breaks in sedimentation, cyclic sedimentation patterns, and gradual environmental changes. [10]
Hauser bases have the empirical formula R 2 NMgX (X = halide). The crystallize as dimers with halide bridges. Attached to Mg is amido (R 2 N) ligands derived from secondary amines 2,2,6,6-tetramethylpiperidine (TMP −) and HMDS −). [3] [4] [5] Amido-bridged Hauser bases exist when the amido ligand is less bulky, such as Et 2 N − and Ph 3 P ...
Wiley's Well is also a popular rockhounding site, beginning in the 1930s with the discovery of geode beds. Despite its popularity over the decades, the area remains rich with chalcedony, citrine, quartz crystals, rhyolite and jasper. Though winters are mild, making the campground a popular destination with seasonal visitors from colder climes ...
The iPr-Turbo-Hauser base crystallizes as a dimeric amido bridged contact ion pair (CIP). [4] Due to the high steric demand of the TMP ligand the dimerization process is sterically hindered. This is why the TMP-Turbo-Hauser base crystallizes as a monomeric CIP. [5] In both structures LiCl coordinates to the magnesium amides.
These Touchet beds are often covered by windblown loess which were deposited later; the number of layers varies with location. [2] [3] [4] The beds vary in thickness from 330 ft (100 m) at lower elevations where a number of layers can be found to a few extremely thin layers at the maximum elevation where they are observed (1,150 ft (350 m)). [1]
A characteristic feature of thundereggs is that (like other agates) the individual beds they come from can vary in appearance, though they can maintain a certain specific identity within them. Thunderegg is not synonymous with either geode or agate. A geode is a simple term for a rock with a hollow in it, often with crystal formation/growth.
The Kem Kem Group (commonly known as the Kem Kem beds [1]) is a geological group in the Kem Kem region of eastern Morocco, whose strata date back to the Cenomanian stage of the Late Cretaceous.