. The fluorspar deposits of southern Illinois . V, L ^r ^\) LEGEND 0^ L amp roplv\T?(?, dikes arid sTuets; Maiisfield ScQidstone , sandst-ane. and,con^lomejate ; Birds^olle, Tribuneand Cypress smidsloue ^scaid^oThe aitd s7talf iOtin liniesloiiei oolitic Jiiiiestom ^ ^^m^ StLouis limestone{ckertf limestone i Veins Faults TulIaJioiua Imestoiierherir 7iiiirstj7ii - OMo sliale \lI black shale/ X. Sti-iki> aiiddip ISIAP AND CROSS SECTION, ROSICLAEE TO KARBERS RIDGE, ILL BxMX ASSISTED ,^XD >•= 1 2 3 imiles BAIN.] GEOLOGY. 31 GEOLOGIC STRUCT
. The fluorspar deposits of southern Illinois . V, L ^r ^\) LEGEND 0^ L amp roplv\T?(?, dikes arid sTuets; Maiisfield ScQidstone , sandst-ane. and,con^lomejate ; Birds^olle, Tribuneand Cypress smidsloue ^scaid^oThe aitd s7talf iOtin liniesloiiei oolitic Jiiiiestom ^ ^^m^ StLouis limestone{ckertf limestone i Veins Faults TulIaJioiua Imestoiierherir 7iiiirstj7ii - OMo sliale \lI black shale/ X. Sti-iki> aiiddip ISIAP AND CROSS SECTION, ROSICLAEE TO KARBERS RIDGE, ILL BxMX ASSISTED ,^XD >•= 1 2 3 imiles BAIN.] GEOLOGY. 31 GEOLOGIC STRUCTURE. GENERVL RELATIONS. Tlie stimetnre of this district stands in marked contrast with thatof the remaining- portion of Illinois. The widespread presence of ex-tensive fanlting and the intrusion of igneous rocks set it oif sharplyfrom the general surrounding region. If the Kentucky-Illinois dis-tj-ict be considered as a whole, it seems to represent a portion of anextensive northwest-southeast monocline or, possibly, the northeasthalf of a dome whose remaining portion has disappeared beneaththe Tertiary deposits of the Mississippi embayment. To the northand east the Mansfield sandstone dips sharply away and becomesdeeply buried beneath the Coal Measures strata. To the south andwest the beds pass, with little dip and no uniformity, beneath thelater sediments. Loughridge gives data suggestive of fau
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Keywords: ., bookauthorge, bookcentury1900, bookdecade1900, booksubjectgeology
