Cross Sections - Cross-Sections - General Cross Sections - Open Cross Sections - Raster Cross Sections. The assumption is made that the geologic map and cross section line (A-A’) have already been prepared, Geological Cross Sections Download. The following discussion outlines this process step-by-step. Generating geologic cross sections with AutoCAD Map and ArcView GIS requires the use of 3D geometry commands within AutoCAD to produce the proper perspective view of the topographic profile and geologic subsurface structures.
Structural geology and ultimately the interpretation of geological maps.The wells studied in the western part of the state, for the most part, are those that penetrate all or nearly all of the Upper Cambrian and Lower Ordovician beds that are present at the location of the well. Therefore, the significance of some of the wells studied necessarily is much greater than that of others.Cramming for the rocks and minerals section of this course might have actually. The importance of a well to this type of investigation is almost proportional to the percentage of the total thickness of the rocks penetrated. Carlson Takeoff Software by Carlson Carlson Takeoff is a cut/fill volumes and data prep (for layout or.
Peter sedimentary rocks once present.Comparison of all the logs of wells that penetrate all or the greater part of the Upper Cambrian and Lower Ordovician beds present shows no outstanding characteristic of the dolomite that persists over a distance of more than a few miles. Peter age are absent in Kansas and the well logs probably do not include the maximum thickness of the pre-St. The evidence indicates that the uppermost deposits of pre-St.
Therefore, for those subdivisions that are identified on the basis of characteristic sand residues, the percentage of sand both in the insoluble residue (right hand column) and in the total sample (left hand column) are shown.For subdivisions that are identified by a relatively large amount of residue consisting predominantly of chert, the percentage of chert in the total sample is plotted in the left hand column. Chert in the Jefferson City-Cotter sequence and at the base of the Cotter sand.These patterns serve to draw attention to outstanding features of the insoluble residues of each of the major subdivisions recognized in the subsurface of Kansas and emphasize the continuity of lithologic zones across the state.Although sand may be the predominant constituent of the insoluble residue, it is commonly too small a percentage of the total sample to be plotted. Chert in the Van Buren-Gasconade sequence.
Data for drawing the cross sections have been derived principally from the wells.shown on each. However, it is believed that the contacts as indicated in the accompanying plotted logs are consistent with the purpose of the study and with the control available for it. Therefore, the space in the left hand column in which symbols representing dolomite types on the original log were plotted is left blank on the cross sections.More detailed examination of samples from closely spaced wells doubtless would provide data that would permit recognition of the point of contact between some of the beds more precisely than is possible in the present report. No attempt has been made to show differences in character of the dolomites (1) because few dolomite types were persistent enough laterally or vertically to afford a criterion for correlation, and (2) because correlations were based for the most part on diagnostic material in the insoluble residue. The dotted pattern that generalizes the position of the sand zone at the base of the Cotter is an exception.The space representing the material in the residue that was not found to be diagnostic of the subdivision was left blank in both columns of the logs represented on the cross section.
The Lamotte sandstone is absent and the Bonneterre dolomite immediately overlies the granite in well 12 in Kearny County and probably in Stafford County (well 10).The Bonneterre and Eminence dolomites thin westward to Chautauqua County and are absent from wells farther west in Rice and Pawnee counties. In Reno, Rice, and Pawnee counties (wells 8, 9, and 11) the Roubidoux dolomite is the oldest formation in contact with the Pre-Cambrian rocks. Older beds reappear in the section in the western part of the state.From Cherokee to Chautauqua counties (wells 2, 3, and 4), moderate thicknesses of Lamotte sandstone, overlain by Bonneterre dolomite, rest on the Pre-Cambrian surface. The section covers a total distance of 427 miles, although the straight-line distance between the Cherokee County well (well 1) and the Kearny County well (well 12) is 370 miles.Figure 11-Diagrammatic cross sections on lines A-A' and C-C'.The formations immediately overlying the Pre-Cambrian surface are progressively younger from the eastern margin toward central Kansas. 6)Section A-A' extends from Cherokee County in the extreme southeastern corner of the state northwestward to Kearny County, passing in westward order through Chautauqua, Cowley, Sumner, Sedgwick, Reno, Rice, Stafford, and Pawnee counties.
The section covers a total distance of 400 miles. 6)Section B-B' extends from eastern Crawford County to western Logan County passing through Wilson, Greenwood, McPherson, Rice, Ellsworth, Barton, Trego, and Gove counties. They are especially thin in Kearny County (well 12).Cross Section on Line B-B' (Fig. The Jefferson City-Cotter sequence thickens from Cherokee County westward to a maximum of 667 feet in Cowley County, but farther west the beds again become thinner. In some areas this occurred at the end of Arbuckle time, in other areas it preceded the deposition of the Chattanooga shale, and in still others it preceded deposition of the Pennsylvanian. In Kearny County (well 12) the Roubidoux dolomite rests on the Bonneterre dolomite.Irregularities in the thickness and regional westward thinning of Jefferson City-Cotter deposits are the result of upwarping and removal of the deposits.
Some of the upper part of the Bonneterre dolomite was removed by post-Bonneterre erosion. Where Lamotte is absent it is probable that the basal Bonneterre rocks are also absent due to overlap on high areas of the surface. On the other hand, the cross section suggests strongly that the Bonneterre was leveled during pre-Roubidoux exposure. The basal bed of well 15 in Greenwood County, which is 17 feet thick, may represent the upper part of the Bonneterre dolomite overlying the Pre-Cambrian granite, the lower part of the Bonneterre dolomite and Lamotte sandstone being absent as result of overlap of upper beds of the Bonneterre onto the high area in the central part of the state. The Lamotte sandstone rests on the Pre-Cambrian surface in Crawford, Wilson, and McPherson counties (wells 13, 14, and 16).
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