Molar-tooth structure is a synsedimentary, combined deformation and early diagenetic feature occurring in calcareous strata of mainly Precambrian age. It consists of arrays of closely spaced, sharply defined, upright veins , and subordinate horizontal sheets and spheroids composed of calcite microspar . Veins are vertically to obliquely oriented, discontinuous, typically strongly squashed or crumpled, and often brecciated.
KeywordsClay Sandstone Shrinkage Calcite Shale
- El Taki, H., and Pratt, B. R., 2009. Synsedimentary deformation in laminated dolomites and evaporites of the Herald Formation (Red River Group): signature of Late Ordovician tectonic activity in southern Saskatchewan. In Summary of investigations 2009, Vol. 1. Saskatchewan Geological Survey, Saskatchewan Ministry of Energy and Resources, Miscellaneous Report 2009-4.1, Paper A-3, p. 10.Google Scholar
- Meng, X., and Ge, M., 2002. The sedimentary features of Proterozoic microspar (molar-tooth) carbonates in China and their significance. Episodes, 25, 185–195.Google Scholar
- Pratt, B. R., 2001. Oceanography, bathymetry and syndepositional tectonics of a Precambrian intracratonic basin: integrating sediments, storms, earthquakes and tsunamics in the Belt Supergroup (Helena Formation, ca. 145 Ga), Western North America. Sedimentary Geology, 141–142, 371–394.CrossRefGoogle Scholar