Model for the combined-flow origin of hummocky cross-stratification

Research Article| April 01, 1987 Model for the combined-flow origin of hummocky cross-stratification A. Nøttvedt; A. Nøttvedt 1Norsk Hydro Research Center, P.O. Box 4313, N-5013 Bergen, Norway Search for other works by this author on: GSW Google Scholar R. D. Kreisa R. D. Kreisa 2Mobil Research and Development Corporation, P.O. Box 819047, Dallas, Texas 75381-9047 Search for other works by this author on: GSW Google Scholar Author and Article Information A. Nøttvedt 1Norsk Hydro Research Center, P.O. Box 4313, N-5013 Bergen, Norway R. D. Kreisa 2Mobil Research and Development Corporation, P.O. Box 819047, Dallas, Texas 75381-9047 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1987) 15 (4): 357–361. https://doi.org/10.1130/0091-7613(1987)15<357:MFTCOO>2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation A. Nøttvedt, R. D. Kreisa; Model for the combined-flow origin of hummocky cross-stratification. Geology 1987;; 15 (4): 357–361. doi: https://doi.org/10.1130/0091-7613(1987)15<357:MFTCOO>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 SocietyGeology Search Advanced Search Abstract Many shallow marine sandstones are characterized by gently dipping trough cross-stratification. There appear to be significant similarities between this low-angle cross-stratification and typical hummocky cross-stratification, and it is proposed that much of what is currently recognized as hummocky cross-stratification is related to low-relief megaripple bed forms that are equilibrium structures for fine-grained sand under combined wave surge and unidirectional currents. The geometry that obtains when these bed forms migrate is low-angle trough cross-stratification. High rates of sedimentation from incipient suspension and limited lateral migration of individual bed forms promote preservation of convex-upward depositional surfaces (hummocks) between troughs. Highly unsteady flow leads to abundant internal scour and drape surfaces. Neither random scour and drape nor oscillatory currents seem sufficient to generate hummocky bed forms. 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.