real estate big mountain montana

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Present along the surface real exposures of the anticline are rocks dating estate from Upper Cretaceous to Paleocene age (Davis big and Hunt 1956). They are, from oldest to youngest: (1) the transgressive Pierre Shale, in which the barite-rich concretions mountain occur in the top 164 feet; (2) the regressive Fox Hills Formation, 0-130 feet of yellow mudstone and sandstone; (3) the Late montana Cretaceous Hell Creek Formation, 260-90 feet of primarily deltaic sediments; and (4) the Paleocene Fort Union Group, 82-245 feet of mostly terrestrial sandstone and real mudstone.

Concretions containing barite range in size from less than 1 foot to 4 feet in diameter and are generally elliptical in shape. They are usually not intact when found on the surface, but this exposes the core material and enables one to determine if the estate and big particular nodule contains barite. A very small percentage of the concretions mountain contain barite crystals. Specimens occur in all exposures of the barite zone, but it appears that the montana concretions in shale adjacent to both the longitudinal and transverse real faults contain the highest barite concentrations. The faulted areas probably created more permeable conditions estate and big that concentrated the flow of mineralizing fluids. mountain All concretions from this zone are fractured to some degree, and the pattern of this fracturing can be used to identify these fault zones. The areas along fault planes were subjected montana to a shearing action that produced a pattern of fracturing that is different from the desiccation real cracking of a normal septarian concretion. The sheared concretions estate consist of a mass of small angular pieces cemented by largely anhedral, pale yellow calcite with small spaces between fragments. They do contain barite, but it is normally in the form of small crystals that are hard to extract unbroken. Desiccated concretions consist of much larger big and mountain pieces with a blocky or columnal form and large, more planer openings. The best crystal-producing concretions have a roughly cubic core surrounded by several polyhedral external blocks. If there was crystallization in the large internal spaces (septa), crystals were free to montana grow without real interference. estate In most cases new crystal growth began big where openings pinched mountain out or at the apex of sharp edges on concretion sections; these conditions are most common in the lower regions of concretions because the base montana sections are seldom real fractured. estate When concretions are opened, big the septa are often filled with fine shale particles and old mountain ant montana nests. This material frequently contains dislodged crystals.

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