California mines and minerals . ould be obtained by the sinking of wells. If it be true that the bitumens are derived from terrestrial andmarine vegetation, deposited in sedimentary strata, and then changedto carbonaceous matter, which was afterwards distilled by the heat ofmetamorphism, then we may expect to find petroleum oil or otherbitumens in unaltered rocks lying above the metamorphic rocks, irre-spective of the age of the unaltered rocks. A number of facts that have been presented in the precedingpages tend to prove that this is the origin of bituminous accumula-tions in California. A c
California mines and minerals . ould be obtained by the sinking of wells. If it be true that the bitumens are derived from terrestrial andmarine vegetation, deposited in sedimentary strata, and then changedto carbonaceous matter, which was afterwards distilled by the heat ofmetamorphism, then we may expect to find petroleum oil or otherbitumens in unaltered rocks lying above the metamorphic rocks, irre-spective of the age of the unaltered rocks. A number of facts that have been presented in the precedingpages tend to prove that this is the origin of bituminous accumula-tions in California. A conclusive determination of the origin of the bitumens is ofgreat importance, for if the origin is as set forth in this monograph,explorations can be continued to such depths so as to reach the meta-morphic rock, and these explorations may be successful, especially soif the bitumens are found near the surface ; but if the bitumens areindigenous to the rocks in which they are found, the depth to whichthey may extend is
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