...gold being chiefly limited to Silurian rocks, that this metal occurs in no inconsiderable quantity in metamorphic rocks belonging as high up in the series as the Cretaceous. Allusion has already been made to the wide-spread occurrence in California of the Cretaceous formation....

...gold being chiefly limited to Silurian rocks, that this metal occurs in no inconsiderable quantity in metamorphic rocks belonging as high up in the series as the Cretaceous. Allusion has already been made to the wide-spread occurrence in California of the Cretaceous formation....

...Indeed, gold, instead of being chiefly limited to Silurian rocks, occurs in no inconsiderable quantity in Metamorphic rocks belonging as high up in the series as the Cretaceous group (see also p. 330). With regard to the detrital auriferous deposits, they consist of materials...

...Silurian fossil ever having been discovered in California. or indeed any where to the west of the n6th meridian. It appears, on the other hand, that no inconsiderable...belonging as high up in the series as the Cretaceous.* While such are the generalizations of Whitney as to the age of the auriferous rocks of the Sierra Nevada,...

...Silurian fossil ever having been discovered in California, or indeed any where to the west of the n6th meridian. It appears, on the other hand, that no inconsiderable...obtained from metamorphic rocks, belonging as high up in Ihe series as the Cretaceous.* While such are the generalizations of Whitney as to the age of the auriferous...