13 
(20) Light grey, thin-bedded quartzite, weathering brownish. Some scat- 
tered grey chert nodules and a few iron nodules are present. There is much 
minor crossbedding throughout the beds. The basal 2 feet are a greenish quartz- 
ite; the 11-foot bed above this is limestone, weathering porous. 46-5 feet 
In the upper 16 feet were found very poorly preserved cup corals and 
SpiriferB. 
Rundle Limestone (Upper Part) (Lower Pennsylvanian) 
(21) Beds concealed, except the upper 10 feet which are light grey lime- 
stones, weathering very rapidly by staling across the bedding plane. These upper 
limestones, if our correlation of sections is correct, are underlain by a continu- 
ation of the soft, black, calcareous shales of section 2, localities 1 to 4, and become, 
accordingly, quickly covered by a soil 126 feet 
(22) Alight grey, calcareous shale, weathering purplish. XJpon its disinteg- 
ration in cold hydrochloric acid there remains a residue of purplish mud. It con- 
tains numerous small chert nodules, many of which, especially upon and near 
the surface of the rock, are a yellowish red jasper. The uppermost beds are of a 
darker colour and very shaly . 12 feet 
Fossils are abundant in the middle bed#. 
(23) Light grey limestone. 53*5 feet 
(a) Limestone, with very little grey chert nodules. 13*5 feet 
( b ) Limestone weathering brownish 3 feet 
(c) Not exposed 37 feet 
(24) Light grey limestone, with scattered black to grey chert nodules. 
Strike north 53 degrees west; dip 33 degrees southwest. 37 *5 feet 
The uppermost 5 feet have numerous large grey chert nodules; these 
5 feet are especially characterized by a very great abundance of Avlopora 
curva and Lophophyllum profundum . A gastropod, somewhat resembling 
Euphemus nodocarinatus , was also noted. 
Chalcedonic pseudomorphs after apatite are here very noticeable. 1 
These perfect hexagons vary in diameter up to 5 mm. and in length up to 
6 mm. The majority have a diameter of 4 mm. and a length of 5 mm. 
They stand out conspicuously upon weathered surfaces but are present in 
the same chemical state to the depth of at least an inch, which is the greatest 
rock thickness of any of our specimens. These occur in the Pennsylvanian 
strata of sections 1, locality 24 (C); 2, locality 11 (c); 3a, locality 1 (C). 
(25) Fine-grained, light grey limestone, weathering brownish. About 6 
feet above the base are many small quartz geodes 21 feet 
(26) Mostly covered. Light grey limestone where exposed 88 feet 
(27) Light grey limestone 10*5 feet 
Contains many specimens of Produdus cora. 
(28) Largely concealed. Dark grey limestone where exposed 78 feet 
(29) Largely concealed 67 feet 
The uppermost foot contains many specimens of Produdus cora, also a 
few specimens of Pustula punctata, Spirifer cameratus, and S. rochymon - 
tanus. 
(30) Dark grey, medium-grained limestone with minor crossbedding 11 feet 
A few cup corals were noted. 
(31) Limestones, alternating light and dark grey, with many large, light grey, 
chert nodules. Crossbedding present in the upper beds 20 feet 
1 Professor C. H. Warren, of tlie Masa. Inat. of Tech., kindly identified the specimens for the writer. 
10277—2 
