GEOLOGY AND PALEONTOLOGY. 79 
are about two feet thick, varying from a blue to deep black in color, and are very 
fossiliferous, while at Carbondale they are fourteen feet thick. Above these 
shales and grading into them lies what Swallow called the ‘‘Spring Rock’’ 
(wrongly correlating it, as he did also the ‘‘Stanton limestone,’’ now known as the 
Burlingame limestone, with limestones of eastern Kansas—the names were used 
by the writer in the previous article on this section), a hard, bluish, argillaceous 
limestone of from one and one-half to two feet in thickness, which has been used 
in paving with good results. These three strata are well exposed in the pits of 
the vitrified brick works, and from there west to the Sargent brick works, east of 
the sugar-mill. At this latter place sixty feet of the overlying strata are exposed. 
The section as made up of this long but continuous exposure is as follows: 
Mi, Abs 1Bicy Mal: 
6. Argillaceous shale, arenaceous in places, olive to blue in color, 
ANGAINELAOSUP PEL Pantryellowentsss acs cet ieks ae ae ete ole a0  @ Ole 6 
5. Blue, impure, argillaceous limestone ....................... 0 ele 
4. Blue, yellow or olive, argillaceous, in places arenaceous 
shales, varying in thickness from 2 to.................. 0) 10. «6 
3. Argillaceous blue limestone, weathering to arusty color.... 1 6 Gee 
2. Argillaceous, bluish to black shale, very fossiliferous....... 2 0 aye KD) 
il, (COAG GA aeRBe Re © CRANES Sea Ve clecreat Sty ate ea Nina te ORE TPO Ne Oe iO LO 
Near the bottom of No. 4 there is generally an impure limestone which, at 
the Sargent brick works, is a foot thick, as shown in the bed of the creek. 
In order to avoid long repetition, the fossils of all these strata, except No. 6, 
are given in one list. They belong principally to Nos.2 and 3, with a few in 
4 and 5. 
Fusulina secalica (Say) Fischer, a. 
Archeocidaris agassizi Geinitz, rr. 
Campophyllum torquium Owen, rr. 
Delicrinus hemisphericus, rr. 
Rhombopora lepidodendroides Meek, c. 
Septopora biserialis (Swallow) Ulrich, r., and other bryozoa as in the pre- 
vious list. 
Productus longispinus Sowerby, aa. 
Productus cora d’ Orbigny, ec. 
Productus costatus Sowerby, c. 
Productus Nebrascensis Owen, r. 
Productus punctatus Martin, r. 
Productus semireticulatus Martin, a. 
Productus symmetricus McChesney, r. 
Productus pertenuis Meek, a. 
Productus sp., r. 
Chonetes granulifera Owen, aa. 
Chonetes glabra Geinitz, c. 
Spirifer cameratus (Hall ) Meek, aa. 
Amboccelia planoconvexa (Shumard) Hall and Clarke, aa. 
Spiriferina cristata (Schlotheim ) Davidson, a. 
Pugnax utah (Marcou) Hall and Clarke, c. 
Orbiculoidea missouriensis (Shumard ) Schuchert, aa. 
Orbiculoidea convexa (Shumard) Schuchert, rr. 
Lingula mytiloides Sowerby, c. 
Seminula argentea (Shepard) Hall and Clarke, aa. 
Hustedia mormoni (Marcou) Hall and Clarke, ec. 
Derbya crassa (Phillips) Hall and Clarke, c. 
