Research Article| February 01, 1949 STRUCTURE OF A PART OF THE NORTHERN BLACK HILLS AND THE HOMESTAKE MINE, LEAD, SOUTH DAKOTA JAMES A NOBLE; JAMES A NOBLE CALIF. INST. TECHNOLOGY, PASADENA, CALIF.; HOMESTAKE MINE, LEAD, S. D.; HOMESTAKE MINE, LEAD, S. D. Search for other works by this author on: GSW Google Scholar JAMES O HARDER; JAMES O HARDER CALIF. INST. TECHNOLOGY, PASADENA, CALIF.; HOMESTAKE MINE, LEAD, S. D.; HOMESTAKE MINE, LEAD, S. D. Search for other works by this author on: GSW Google Scholar A. L SLAUGHTER A. L SLAUGHTER CALIF. INST. TECHNOLOGY, PASADENA, CALIF.; HOMESTAKE MINE, LEAD, S. D.; HOMESTAKE MINE, LEAD, S. D. Search for other works by this author on: GSW Google Scholar Author and Article Information JAMES A NOBLE CALIF. INST. TECHNOLOGY, PASADENA, CALIF.; HOMESTAKE MINE, LEAD, S. D.; HOMESTAKE MINE, LEAD, S. D. JAMES O HARDER CALIF. INST. TECHNOLOGY, PASADENA, CALIF.; HOMESTAKE MINE, LEAD, S. D.; HOMESTAKE MINE, LEAD, S. D. A. L SLAUGHTER CALIF. INST. TECHNOLOGY, PASADENA, CALIF.; HOMESTAKE MINE, LEAD, S. D.; HOMESTAKE MINE, LEAD, S. D. Publisher: Geological Society of America Received: 29 Mar 1948 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1949, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1949) 60 (2): 321–352. https://doi.org/10.1130/0016-7606(1949)60[321:SOAPOT]2.0.CO;2 Article history Received: 29 Mar 1948 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation JAMES A NOBLE, JAMES O HARDER, A. L SLAUGHTER; STRUCTURE OF A PART OF THE NORTHERN BLACK HILLS AND THE HOMESTAKE MINE, LEAD, SOUTH DAKOTA. GSA Bulletin 1949;; 60 (2): 321–352. doi: https://doi.org/10.1130/0016-7606(1949)60[321:SOAPOT]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The pre-Cambrian rocks of the northern Black Hills in the vicinity of the Home-stake Mine show the effects of extreme isoclinal folding on which has been superimposed shear folding crossing the isoclinal axial planes at small angles. An attempt has been made to distinguish the two types of folding in all scales of folds from those of microscopic size to those large enough to appear on the regional map.Enough Cambrian cover remains in this area to permit contouring the top of the pre-Cambrian rocks. These contours, which essentially measure post-Cretaceous deformation, show a close correlation between doming of the district and the intrusion of a stock of Eocene age. Several other domes in the northern Black Hills, previously called laccoliths, are believed to be due to stock intrusion.The deformation of pre-Cambrian rocks by the Tertiary intrusive bodies is more difficult to interpret. There are, however, many small-scale deformations attributable to igneous intrusion, and probably there are large ones as well. Whether the shear folds crossing the isoclinal axial planes are due to Tertiary igneous intrusion or, like the isoclinal folds, are of pre-Cambrian age cannot be answered at this time. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.