. [Reports]. Devonian | Grand Tower (Hamilton and Onondaga.)[Clear Creek (Oriskany.) (14). P RE-CAM BRIAN FORMATIONS. 15 Silurian Upper Cambrian (Ozarkian ofE. O. Ulrich) {Bailey (Lower Heidelberg)Niagara (Bainbridge)Girardeau (Cape Girardeau)Hudson River (Thebes.)f Kimmswick (Receptaculites.) ... J Plattin (Trenton, Blaek River or Birdseye.) City. Roubidoux (Incl. Bolin sandstone.)Gasconade (Incl. Gunter sandstone.)Unconformity (?)| Potosi. | Unconformity (?) I Doerun Derby \ Elvins of I Davis Middle Cambrian (Taconic or f
. [Reports]. Devonian | Grand Tower (Hamilton and Onondaga.)[Clear Creek (Oriskany.) (14). P RE-CAM BRIAN FORMATIONS. 15 Silurian Upper Cambrian (Ozarkian ofE. O. Ulrich) {Bailey (Lower Heidelberg)Niagara (Bainbridge)Girardeau (Cape Girardeau)Hudson River (Thebes.)f Kimmswick (Receptaculites.) ... J Plattin (Trenton, Blaek River or Birdseye.) City. Roubidoux (Incl. Bolin sandstone.)Gasconade (Incl. Gunter sandstone.)Unconformity (?)| Potosi. | Unconformity (?) I Doerun Derby \ Elvins of I Davis Middle Cambrian (Taconic or f Cambrian, restricted, of < Bonneterre. E. O. Ulrich) [ Lamotte. Unconformity. Huronian Pilot Knob. Unconformity.( Diabase. Laurent ian . Granite. t Rhyolite. PRE-C AM BRIAN. The oldest rocks in the State are those of igneous origin oc-curring in the southeastern part, and making up what is knownas the St. Francois mountains. The distribution of these rocks isshown on the accompanying general geological map, see Plate XL. The igneous rocks are mainly rhyolite (porphyry) and granit
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