. [Reports]. or to the Cambrian. It may have been sub-merged more than once, but of this we have no evidence. The firstperiod of submergence resulted in the deposition of materialsv/hich are now represented by the quartzite, slate and conglomer-ate, associated with the iron ores of Pilot Knob. The position ofthese rocks leads one to suppose that the entre area was inundatedby the ocean during that period. The deposits which remain areof such a fragmentary character, that it is impossible to estimatethe duration of the period of submergence. For convenience wewill speak of these rocks as belong
. [Reports]. or to the Cambrian. It may have been sub-merged more than once, but of this we have no evidence. The firstperiod of submergence resulted in the deposition of materialsv/hich are now represented by the quartzite, slate and conglomer-ate, associated with the iron ores of Pilot Knob. The position ofthese rocks leads one to suppose that the entre area was inundatedby the ocean during that period. The deposits which remain areof such a fragmentary character, that it is impossible to estimatethe duration of the period of submergence. For convenience wewill speak of these rocks as belonging to the Huronian, altho theirabsolute strategraphic position has not been determined. The sediments deposited in the Huronian sea were derivedfrom the Archean granite, rhyolite and diabase referred to lead contained in the Archean rocks was probably transferred,in part, at least, to the Huronian sediments. The presence of iron Missouri Bureau of GtBOLOGY and Mines. Vol. IX. Series 2, Plate
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