212 



obtained from Mr. W. B. Blake, engineer of the P., C, C. & St. L. Railway, ac- 

 currate data in regard to the per cent, of grade, length and depth of the cuts, and 

 distance between same, for the steep Madison hill grade of the road above men- 

 tioned. The elevation of the terrace upon which Madison stands is approxi- 

 mately 60 ft. above river level, and the elevation of North Madison above Madi- 

 son is 427 ft. The old reservoir at the south end of the big cut is given in Bor- 

 ,den's report (loc. cit.) as 210^ ft. above low water of the Ohio River. The data 

 given me by Mr. Blake are as follows: Grade, five and eighty-nine one-hundredths 

 per cent. (5.89'/^); distance of south end of south cut from low water mark on 

 north side of Ohio River, 2,700 ft.; distance through south cut, 800 ft. ; distance 

 from north end of touth cut to south end of north cut, 1,100 ft.; distance through 

 north cut, 1,100 ft.; besides this there are north of the north cut about 1,500 ft. of 

 cut in places 40 ft. deep. The maximum depth of the south cut is 60 ft. and of 

 the north cut 100 ft. The section which follows was measured independently of 

 these figures and departed very little from them. One or two corrections have 

 been made, however, in accordance with the above data. Section of the cut at 

 Madison (§1.12 A.): 



Ft. In. 



71 — Massive whitisli limestone 10 



70— One layer of bluish- white limestone 5 



69 — Thin-bedded limestone like No. 70 5 



68— Blue shale 2 6 



67 — White arenaceous limestone 3 10 



66— Shaly sandstone and shale 8 3 



65 — Massive white arenaceous limestone (Niagara) 2 6 



64 — From a few inches to nearly a foot of pinkish or yellowish to 



salmon colored crystalline limestone (Clinton?) 1 



63 — Massive white arenaceous limestone 4 2 



62 — Thick-bedded argillaceous arenaceous limestone 9 8- 



61 — Same as 62, but banded on weathered surface with pink, gray, and 



bufT 12 10 



60 — One massive conspicuous arenaceous layer 3 6 



59 — Thin-bedded, argillaceous, arenaceous, weathering brownish, with 



some calcareous layers containing Bryozoa 7 



58 — Nothing to four inches of coarse limestone with Ordovician fossils . . 4 



57 — Sandstone with leuticles of limestone containing Bryozoa 3 



56 — Argillaceous layer. Favhtella stellata 2 



55-Shale 6 



54 — Fa cislella slellala 1 2 



53 — Thin layers of limestone alternating with argillaceous and sandy 



layers. Bryozoa (aa). Ro finest luina. Hcbertella 5 3 



52 — Massive soft sandstone 7 8 



