AREA NORTH OF STUART 695 



shale immediately across the fault to the east nor in the outcrops along 

 Middle River farther south. 



There is the further positive argument (to be presented later) that the 

 set of beds described north of the fault fits into the Henrietta (Appa- 

 noose) substage as seen north of Centerville, Iowa. 



The fault-plane, then, extends between the outcrop of true ITertha 

 limestone with the Pleasanton shale beneath it, as seen directly north of 

 Earlham, and the outcrop a mile and a half west-southwest from that 

 outcrop. 



Area North: of Stuart, along Deer Creek, North of Fault 



Farther west, north of Stuart, these same beds north of the fault ap- 

 pear along a creek knoAvn as Deer Creek. The following section may be 

 found extending from the brow of the hill south of Deer Creek down to 

 the bed of that stream, along the main road north from Stuart, only 2 

 miles from that town. A considerable portion of the section is dupli- 

 cated along Eocky Eun, a mile to the east, .on the opposite side of the 

 same hill : 



Section along Road in Penn Township, Guthrie County, east of the northeast 

 Quarter of Section 20, two Miles north of Stuart 



Feet. Inches. 

 7. Limestone, gray, in loose weathered fragments ; crinoid stems 



and many shell fragments 4-5 



G. Shale, clayey, red S 



5. Limestone, gray ; three main divisions with shaly partings, 

 lowest division nodular; Cosposita suotilita, corals, and many 



shell fragments 5 



4. Shale, gray, calcareous in places 4 



3. Sandstone, brown, shaly (ripple-marks at Rocky Run) 1 3 



2. Shale, clayey, light gray 15 



1. Limestone, brownish, arenaceous ; fragmental part of are- 

 naceous balls; Composita subtilita, apparently Marginifera 



muricata; few fossils at this point 3 10 



Bed of Deer Creek. 



Total 42 1 



Following Deer Creek down from the base of the above section the 

 strata are continued. One comes on 20 feet of shale beneath the limestone 

 (number 1) ; then a foot and a half of blue limestone containing Com- 

 posita subtilita, Marginifera muricata (an index fossil of the Des Moines 

 stage), Productus cora, gasteropods, and numerous pelecypods. Then 

 come 6 feet of a black shale, with 10 inches of coal beneath it. (It is this 



