The morphology and hydro-chemistry of a gypsum karst, Codroy, Newfoundland.

Abstract

<p> In the summer of 1976 a study was undertaken of the Woodville/Codroy gypsum karst plain, an area of about 4 km^2 in southwest Newfoundland. Geology of the gypsum is revised and the general geomorphology described. Sinkholes were surveyed and classifications based on several criteria are presented. Hydro-chemistry is reported in some detail from field and laboratory analyses. It is shown that the gypsum karst system evolves in much the same \'Jay as that of limestone but at a greater rate, permitting comprehensive study of morphologic evolution within post-glacial karst areas. Processes at work in the gypsum may be initially simpler than those in carbonates but complexities of rock characteristics complicate the picture. Some water measurements indicate diffuse flow conditions in the aquifer, while others suggest conduit flow; it is demonstrated that both diffuse and conduit flow systems may operate in conjunction. </p>