. Bulletin of the Geological Society of America. Geology. 192 C. K. KEYES—A DEPOSITIONAL MEASURE OF UNCONFORMITY they consider as makino- up the Coal Measures of the state. Winslow's section, however, is not without interest, and is giv^en below: Sebastian stage. Spadra stage. Norristown stage. Booneville stage. Appleton stage. Danville stage. Relations of Arkansan Series to great Unconformity correla tion From the foregoing it is seen that the Lower Carboniferous or Missis- sippian series, with its minor divisions, is well defined in northern Arkansas. The Kaskaskia terrane is easily identifi
. Bulletin of the Geological Society of America. Geology. 192 C. K. KEYES—A DEPOSITIONAL MEASURE OF UNCONFORMITY they consider as makino- up the Coal Measures of the state. Winslow's section, however, is not without interest, and is giv^en below: Sebastian stage. Spadra stage. Norristown stage. Booneville stage. Appleton stage. Danville stage. Relations of Arkansan Series to great Unconformity correla tion From the foregoing it is seen that the Lower Carboniferous or Missis- sippian series, with its minor divisions, is well defined in northern Arkansas. The Kaskaskia terrane is easily identified, passing upward south of the Boston ridjre into the Coal FiGi'KE y. — Rclntions oj Arknnsnn Scries {hlnrk) to the other Cnrboniferous Series. Tlie basal horizon of the lowest Coal Measures of Missouri, or Des Moines series, is believed to extend southward, and to the south of" the Arkansas river to coincide ap})roximately with the Grady coal horizon, or the base of the Cavaniol. With the base of the Des Moines series of Missouri thus located in Arkansas, and the top of the Lower Carboniferous well defined, it leaves ^ in the south an immense thickness of nearly 18,000 feet of sediments that are in the north wholl}^ unre[)res6nted by deposits. The 18,000 feet of sediments were manifestly laid down during the period represented by the stratigraphic break at the base of the northern Coal Measures. DEPOSITIONAL MEASURE OF EROSION PERIOD The magnitude of the hiatus at the base of the Coal Measures of Iowa, Missouri, and Kansas is readily appreciated when we find a place where. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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