Changes

==28,30-bisnorhopane==

==28,30-bisnorhopane==

[[file:oiloil-and-oilsource-rock-correlations_fig8-32.png|thumb|left|{{figure number|10}}See text for explanation.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-32.png|thumb|{{figure number|10}}m/z 191 mass fragmentogram of an oil with a high relative concentration of 28,30-bisnorhopane, eluting to the left of norhopane (C₂₉ hopane).]]

Sometimes in great abundance, 28,30-bisnorhopane has been found in a few important source rocks and related oils (Monterey Formation, Kimmeridge Clay). It is probably of microbial origin. Because bisnorhopane is most common in sulfur-rich environments, its origin may have to do with bacteria that participate in the sulfur cycle. Denis Miiller (personal communication, 1994) notes that in the Monterey oils of southern California, bisnorhopane contents are proportional to sulfur contents.

Sometimes in great abundance, 28,30-bisnorhopane has been found in a few important source rocks and related oils (Monterey Formation, Kimmeridge Clay). It is probably of microbial origin. Because bisnorhopane is most common in sulfur-rich environments, its origin may have to do with bacteria that participate in the sulfur cycle. Denis Miiller (personal communication, 1994) notes that in the Monterey oils of southern California, bisnorhopane contents are proportional to sulfur contents.