A Michigan Preliminary Section. — Grabaii. 187 
front. The exterior of the shell is striate, the interior pustu- 
lose. When worn, the shell appears pnnctate. A few fenes- 
telloids occnr, lint other fossils are very rare. 
Loc. 7. This is at Sta. 21, somlething more than two-tenths 
of a mile north of the preceding locality. The rock is a dark- 
colored, somewhat shaly, fine-grained hitnminous limestone, 
and lies just below the shales of Loc. 6. It is exposed at the 
base of a terrace, on the w^est side of the road, and fossils are 
very rare in the exposed portion. 
Loc. 8. This is at Sta. 22, near the forks of the road south 
of Long lake. The rock is thin-bedded, gray, weathering to 
buff, and highly fossiliferous. Favosites and Acervularia oc- 
cur, but not in very large masses. Atrypa reticularis is the 
most abundant brachiopod, being represented by a.n extremely 
convex variety. Several species of Stropheodonta occur, 
among which a variety of vS. demissa, and vS'. erratica, and 6^. 
incquistriata should be mentioned. Cyrtina unibonata alpenen- 
sis also occurs. These limestones are probalily a part of the 
stratum 4 series of the Churchill well. 
Loc. 10. This exposure is at Sta. 24, where Hell creek, the 
outlet of Long lake, cascades over some limestone ledges. 
This locality is ofif the section, and the rock here exposed ap- 
pears to be the correlative of the limestone series No. 6 of the 
Churchill well. Acervularia and Favosites occur here, and 
with these Spirifer granulosus, Sp. niucronatus, Atrypa reticu- 
laris, and Rhipidomella cf. R. z'anu.renii. This same rock prob- 
ably crops out close to the lake. 
Locs. ii-i^. These are small outcrops of limestone 
along the roadside at Stas. 26, 27 and 29 respectively. Thev ap- 
pear to belong to the limestone lied (8) which underlies the 
blue shale of Long lake ( 7 ) , and contain Acervularia, Gypidula, 
and other fossils characteristic of the massive limestones. 
Loc. 14. This is at Sta. 33, half way between Long and 
Grand lakes. The best outcrops are along the roadside and on 
the farm of Mr. Rabiteau. The rock is thin-bedded and ex- 
tremely fossiliferous, the fossils weathering out in relief. The 
limestone is not very pure, an earthy residuum remaining on 
the solution of the lime. This is by far the most fossiliferous 
series of beds in the region, the largest number of species in the 
collection having been obtained from the outcrops of this rock. 
