PAPERS BY MEMBERS I 29 



this rock. The thickness of the formation is about 75 feet, 

 and it seems to lie with some degree of unconformity upon 

 the subjacent Menard limestone. The name of the formation 

 is derived from Palestine township, in Randolph County, 

 where excellent exposures may be seen. 



9. Clore Formation. 



General characters. The highest formation in the Ches- 

 ter group in Randolph County, is a limestone immediately 

 overlying the Palestine sandstone. The greatest thickness 

 actually measured in Randolph County is 30 feet, but it cer- 

 certainlv exceeds this thickness in many localities. The 

 passage beds from the underlying sandstone to the Clore 

 limestone, consist of arenaceous and calcareous shales, with 

 some beds of limestone- occupying, in places, an interval of as 

 much as 25 feet below the more continuous limestone strata. 

 The lithologic characters of the limestone beds are variable. 

 some being thin bedded and almost shaly. others being similar 

 to the ^lenard in texture and hardness, but usuallv darker in 

 color, while others are more granular or crystalline. Some 

 shale beds are included in the formation. 



The Clore limestone caps the summits of the hills upon 

 which the city of Chester is built, and it outcrops in the 

 heads of several of the ravines adiacent to the town. The 

 formation also caps other of the higher hills east and north- 

 east of Chester exposures being present in the heads of the 

 ravines on the southwest side of the high ridge extending 

 from Clore school to the Randolph Countv Farm. The most 

 extensive exposures which have come under observation are 

 in Bremen township of Randolph County, about two miles 

 northeast of the village of Bremen, where a small anticlinal 

 flexure brine-s this limestone to a lower elevation and its sur- 

 face outcrops spread out on either side of Little Mary's River. 



(1) Proc. Amer. Ass. Adv. Sci., vol. 11. pt. 2. p. 5. (1858). 



(2) Trans. Albany Inst. vol. 4, p. 2 (1858); Geol. Surv. Iowa. vol. 

 1, pt. 1. p. 107 (1858). 



(3) Trans. St. Louis Acad. Sci.. vol. 2. pt. 1. p. 189 (1863): Geol. 

 Surv. 111., vol. 1, pp. 350-455 (1866). 



(4) Geol. Surv. 111., vol. 1. pp. 77-83. 284-292. 305-308 (1866). 



(5) U. S. G. S.. Prof. Paper, No. 36, pp. 24, 36-66.(1905). 



(6) Trans. St. Louis. Acad. Sci., vol. 1. p. 406 (1859). 



(7) This is not a published statement, but a verbal statement 

 made in the course of a discussion of the problem with the writer. 



