. Conodonts from the Glen Dean formation (Chester) of the Illinois basin. Conodonts; Paleontology; Paleontology. GLEN DEAN CONODONTS 15 The latter, next to Cavusgnathus unicornis, is the most abundant species in the Glen Dean Formation. The megafossils show a similar change in the southern area (No- sow, Swann, personal communications). In many aspects, the conodont faunas of these two southern localities resemble those of the upper conodont zone of the Barnett Formation of Texas and the Delaware Creek Member of the Caney Shale of Okla- homa. Conclusions The following conclusions are indicated
. Conodonts from the Glen Dean formation (Chester) of the Illinois basin. Conodonts; Paleontology; Paleontology. GLEN DEAN CONODONTS 15 The latter, next to Cavusgnathus unicornis, is the most abundant species in the Glen Dean Formation. The megafossils show a similar change in the southern area (No- sow, Swann, personal communications). In many aspects, the conodont faunas of these two southern localities resemble those of the upper conodont zone of the Barnett Formation of Texas and the Delaware Creek Member of the Caney Shale of Okla- homa. Conclusions The following conclusions are indicated: (1) The conodonts in the Glen Dean For- mation are virtually unaffected by changes in lithology and therefore will be useful for correlation between facies; (2) the abun- dance and variety of conodonts in limestone opens an avenue of stratigraphic investiga- tion in many dominantly carbonate sections which have received little attention from conodont workers; (3) conodont faunas are relatively uniform within the Chester Se- ries over broad geographic areas. SYSTEMATIC DESCRIPTIONS The type and figured specimens de- scribed and illustrated in this paper have been reposited at the Illinois State Geologi- cal Survey. Under the subheading Distri- bution in the discussion of each species, the formations in which it occurs are listed. For detailed information about strati- graphic and geographic distribution of each species see table 1. LOG. 12-MULZER BROS. QUARRY Siltstone, tan, thin-bedded, stialy. 9' Shale, dark gray to black, fissile, silty and micaceous. 25" Shale, medium to dark gray, calcareous, silty in upper part, fossiliferous; with irregular thin beds of argillaceous crinoidal limestone, one bed very sandy. 28' 3" Limestone, gray, medium to massive-bedded, portly crinoidal, partly oolitic, partly cross-bedded, laterally variable and locolly dolomitic. 23*9". ir Q_ or Fig. 12.—Mulzer Brothers Quarry, locality 12. Ap- proximately miles N. of junction o
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