Silurian Reefs of Southwestern Ontario
REEFS of Silurian age are recognized in southwestern Ontario, both in outcrop and from subsurface information. This paper deals with the so-called 'pinnacle' reefs witch are known only in the subsurface. For the purpose of this paper, the pinnacle reefs are arbitrarily defined as those structures having a height of over 250 feet and a length of less than two miles. This definition eliminates numerous mounds and other broader, more subdued, structures of less certain origin, found in subsurface beds.
dolomite, dolomite, Ontario, pinnacle, reefs, Silurian, formation, Growth, Oil, Oils, Ontario, Pinnacle reefs, Reefs, Shales, Structure