Geological Survey of Illinois, Volume 3

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State journal steam Press, 1868 - Geology
 

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Page 355 - ... near the termination) by distinct furrows, which are deeper on each side than at the middle. Lateral lobes with eight or nine well defined arched segments, which become more oblique posteriorly, and are defined to near the edge of the smooth margin ; each divided by a furrow deeper than those between, and like in those of the pleurae, the anterior division being slightly narrower than the other at the inner end. "Surface (of cast) smooth, except traces of small scattering tubercles on the anterior...
Page 501 - ... or coalesce laterally, so as to form little transverse ridges. Above, there is also a row extending horizontally to each superior lateral angle, with a few less regularly arranged nodes on the sides below these. A single transversely elongated node sometimes also occurs on the little radiais, and one less distinctly defined also sometimes on each of the pieces between this and the next bifurcation.
Page 432 - Shell rather small, turbinate. or obovate, very slightly unsymmetrical ; seotion circular, or nearly so ; chambered part rapidly expanding, with sides slightly convex above. Non-septate part very short, or three times as wide as long, rounding in abruptly above ; aperture contracted, but exact form unknown. Septa only moderately concave, nearly equidistant at all points, excepting near the outer chamber and the apex, where they are more crowded ; at about the widest part of the shell, separated by...
Page 6 - ... Pennsylvania. Prof. AH Worthen, State geologist of Illinois, also attempted to correlate the Western Kentucky coals with those of his own State, but with no more success than Cox had done. He constructed a general section for Illinois and on comparing it with the Kentucky section of Owen concluded “that there are no beds in Illinois that can be referred to those in that section intervening between the Mahoning and Anvil-rock sandstones, and no sandstone associated with our upper coals that...
Page 331 - SHELL attaining a rather large size, gradually tapering, and a little curved; annulations large, prominent, rather obtuse near the smaller end; separated by rounded constrictions of about 0.10 inch breadth at the larger extremity of a specimen one inch or more in length. Surface marked by numerous, very fine, regular, closely arranged longitudinal striae, most distinctly marked in the rounded depressions between the annulations. Aperture circular. Length...
Page 174 - ... south 31 degrees 38 minutes west 231.8 feet ; thence west 120.0 feet ; thence south 1 degree 30 minutes west 204.6 feet ; thence north 65 degrees 16 minutes west 766.7 feet to the west line of said section 19; thence north 522.4 feet to the point of beginning, containing 246.0 acres. A tract of land in the northwest quarter of the northeast quarter of section 13, township 6 north, range 1 east, Salt Lake base and meridian, being more particularly described as follows : Beginning at the southwest...
Page 353 - ... one oblique, the other two transverse, and not always strongly defined quite out to the lateral margins; anterior lateral lobe longer, more oblique, and, at its outer end, wider than either of the other two. Occipital segment widest and most prominent in the...
Page 95 - VEGETATION IN THE DRIFT DEPOSITS OF ILLINOIS. Jersey County, borders on the Mississippi. In this county fragments of Wood, and even trees of considerable size are often met with in sinking wells or in making other excavations in "the plastic clay." By "the plastic clay" is here meant the lowest portion of the northern drift. It is overlain by a layer of twenty or thirty feet of gravel and sand, with boulders. This last is overlain by about twenty feet of yellowish-brown clay rising to the surface....
Page 327 - Shell trigonal, compressed, subequivalve, extremely inequilateral ; posterior side long, compressed and strongly alate ; the wing very large, produced, pointed, and not separated from the alate posterior margin by a distinctly defined sinus ; margin below the wing sloping obliquely forward to the basal angle ; cardinal margin the longest part of the shell, straight and much compressed from immediately behind the beaks. Anterior side truncated nearly vertically from the beaks, about half way down...
Page 7 - ... believe that two different outcrops of the same bed of sandstone in Kentucky have been mistaken for distinct beds, occupying different stratigraphical positions, and by adopting this supposition they have increased the thickness of the measure 300 feet more than they really attain, and nearly double the number of their workable coals. That this is the true explanation of the want of parallelism between our section and theirs, seems highly probable from the general correspondence of the strata...

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