74-8 C. 0. Dunbar — Stratigraphy and Correlation 



exposed, it is generally whiter and more heavily bedded 

 than the latter. 



The formation extends nearly across the state, attain- 

 ing a thickness of 55 feet near the mouth of Big Sandy 

 Eiver in the north, and showing an almost equal thickness 

 at Cerro Gordo and Grandview in northern Hardin 

 County. It is well developed in the vicinity of Perryville 

 and Parsons, where it forms "chert" hills and has been 

 largely quarried for road metal. 



In successive outcrops the Harriman novaculite rests 

 upon the mid- Silurian and various members of the Lin- 

 den group, giving the clearest evidence that it is sepa- 

 rated from the latter by a considerable break and interval 

 of erosion. Near the mouth of Big Sandy River it lies 

 above the highest layers of the Birdsong shale, while on 

 Sycamore Creek near Holladay it succeeds a zone 20 

 feet lower, and within 2 miles to the east on Wolf Creek 

 it rests on the Decatur, all of the Linden being locally 

 absent through erosion. Further south at Perryville, it 

 rests again on the Birdsong shale, but 6 miles further to 

 the southwest at Decaturville, the two formations are 

 separated by the Decaturville chert. At Grandview it 

 locally succeeds the Quail limestone, though the latter is 

 absent at Cerro Gordo, and here it rests on the Ross 

 member of the Olive Hill formation. Further southward, 

 where the Quail limestone is better developed, the Har- 

 riman formation is absent. 



This novaculite is generally fossiliferous, but unevenly 

 so. Near the mouth of Big Sandy River, fossils could 

 be found only near the top, but the portion exposed on 

 Cypress Creek near Camden is rich in organisms, and 

 here was secured the largest fauna. At Perryville the 

 middle portion is abundantly fossiliferous, but the upper 

 and lower part only sparingly so, while the section at 

 Grandview is moderately fossiliferous. The fossils are 

 preserved as natural molds and casts similar to those in 

 the Camden "chert." The fauna of twenty-five species 

 includes Leptcena ingens n. sp. (very large), Leptostro- 

 phia magniventra, Anoplia nucleata, Chonostrophia com- 

 planata, Plethorhyncha cf. barrandei, Rensselceria ovoi- 

 des, Oriskania saffordi n. sp., Spirifer murchisoni, S. 

 arenosus, 8. paucico status, Metaplasia pyxidata, Meris- 

 tella lata, M. rostellata, Anoplotheca dichotoma, Lepto- 

 coelia fabellites, Platyceras gebhardi, etc. 



