- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
An unconformity having no distinct surface of separation or sharp contact, as at an erosion surface that was originally covered by a thick residual soil, which graded downward into the underlying rocks and was partly incorporated in the overlying rocks; e.g., a nonconformity between granite and overlying basal arkosic sediments derived as a product of its disintegration.
Industry:Mining
An unconformity having no distinct surface of separation or sharp contact, as at an erosion surface that was originally covered by a thick residual soil, which graded downward into the underlying rocks and was partly incorporated in the overlying rocks; e.g., a nonconformity between granite and overlying basal arkosic sediments derived as a product of its disintegration.
Industry:Mining
An unconformity in which the bedding planes above and below are essentially parallel, indicating a considerable interval of erosion (or sometimes of nondeposition), and usually marked by a visible and irregular or uneven erosion surface of appreciable relief. The term formerly included what is now known as paraconformity.
Industry:Mining
An unconformity in which the bedding planes above and below are essentially parallel, indicating a considerable interval of erosion (or sometimes of nondeposition), and usually marked by a visible and irregular or uneven erosion surface of appreciable relief. The term formerly included what is now known as paraconformity.
Industry:Mining
An unconformity in which the bedding planes above and below are essentially parallel, indicating a considerable interval of erosion (or sometimes of nondeposition), and usually marked by a visible and irregular or uneven erosion surface of appreciable relief. The term formerly included what is now known as paraconformity.
Industry:Mining
An unconformity in which the older underlying strata dip at a different angle (generally steeper) than the younger overlying strata.
Industry:Mining
An unconformity that is strictly limited in geographic extent and that usually represents a relatively short period, such as one developed around the margins of a sedimentary basin or along the axis of a structural trend that rose intermittently while continuous deposition occurred in an adjacent area. It may be similar in appearance to, but lacks the regional importance of, a disconformity. Compare: regional unconformity
Industry:Mining
An unconformity that separates older rocks that have been subjected to erosion from younger sediments that cover them; specif. disconformity.
Industry:Mining
