Bulletin of the Geological Society of America . egular brown spots appear almost like inclosed fragments in theprevailing grayish white mass; but the frayed nature of the boundaryline of these brown spots shows that they are due to local oxidation ofthe furruginous contents or to infiltration. At the same time the stratumloses its sharply defined upper edge and it becomes impossible to drawthe line between this supposed Carlile member and the overlying white,chalky Timpas limestone. The two are apparently one. 2 N. H. Darton : TJ. S. Geol. Survey, Professional Paper No. 52, 1906, p. 28. 3 Geor
Bulletin of the Geological Society of America . egular brown spots appear almost like inclosed fragments in theprevailing grayish white mass; but the frayed nature of the boundaryline of these brown spots shows that they are due to local oxidation ofthe furruginous contents or to infiltration. At the same time the stratumloses its sharply defined upper edge and it becomes impossible to drawthe line between this supposed Carlile member and the overlying white,chalky Timpas limestone. The two are apparently one. 2 N. H. Darton : TJ. S. Geol. Survey, Professional Paper No. 52, 1906, p. 28. 3 George W. Stose : Folio, U. S. Geol. Survey No. 186, 1912, p. 6. XXXIII—Bill. Geol. See. , Vol. .34, 1922 498 H. B. PATTOX CARLILE SHALE AND TIMPAS LIMESTONE The above described characteristics are well shown at the base of thecliff on the south side of Horse Creek, in the northeast quarter of section30, township 23 south, range 53 west, and they continue for 5 or 6 milesnortheast of this point, which is as far as the field-work wa^ Figure 2.—Contact of Timpas Limestone and Carlile Shale The contact occui*s in Anderson Arroyo, about 7 miles south of La Junta. The pho-tograph shows the soft black shale at bottom, the 3-foot brown limestone that marksthe top of the Carlile shale in the middle, and the white, basal Timpas limestone atthe top. Carlile Fossil ix the Timpas Limestone In line with the observed merging of these two limestone members atthe top of the Carlile and the bottom of the Timpas is the discovery of arecognized characteristic Benton fossil in the basal limestone of theTimpas. Xear the center of the east half of section 27, township 22south, range 53 west, and about 3 miles east of the location above given,a specimen of Inoceramus was collected near the base of the Timpaslimestone. This fossil has been identified bv Prof. Junius Henderson,of the University of Colorado, as Inoceramus Idbiatm, a form consideredcharacteristic of the Benton group and ver
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
