WI1 k'ndle AND ] FAUNULES OF GULF BROOK SECTION. 103 
easily secured from the outcrop of the limestone in a field a few rods 
east of the brook. 
Zone 78 of Gulf Brook section (1455 A).— Above the fish beds are 
9 feet of purplish beds, from which no fossils were secured. 
Zone 79 of Gulf Brook section (1455 A). — An arenaceous impure 
iron ore contains the following- faunule: 
Faunule of zone 79 of Gulf Brook section (1455 A). 
[a, abundant; r, rare.] 
1. Orthothetes chemungensis (r). 13. Cryptonella cf. eudora (a). 
2. Camarotoechia cf. eximia (a). | 4. Spirifer disjunctus (a). 
The Cryptonellas are of very large size, as in the preceding zones. 
Zones 80 to 86 of Gulf Brook section (1455 A). — These zones contain 
very few fossils. 
Zone 87 of Gulf Brook section (14-55 A).— Four inches of gray 
limestone hold the following faunule: 
Faunule of zone 87 of Gulf Brook section ( 1455 A ) . 
[a, abundant; c, common; r, rare.] 
1. Orthothetes chemungensis (c). I 3. Cryptonella eudora var. (a). 
2. Camarotoechia cf. eximia (r). | 4. Spirifer disjunctus (a). 
The shells of No. 4 have a high area, deep sinus, and prominent fold, 
the general contour of the shell presenting a strong contrast to the 
type of shell occurring in zone 73. The shells of 0. chemungensis 
are all small, none exceeding one-half inch in length. 
Zone 88 of Gulf Brook section (14.55 A). — Nine feet of barren shale 
follow the last zone. 
Zone 89 of Gulf Brook section (1455 A). — This zone contains the 
following faunule: 
Faunule of zone 89 of Gulf Brook section ( 1455 A ) . 
[a, abundant; c, common; r, rare.] 
1. Stropheodonta (Douvillina) mucro- 
nata (r). 
2. S. (Leptostrophia) perplana var. ner- 
vosa (r). 
3. Orthothetes chemungensis (c). 
4. Schizophoria striatula (c) . 
5. Camarotoechia cf. eximia (c). 
6. Atrypa spinosa (a). 
7. Spirifer disjunctus (r). 
8. Sphenotus sp. (r). 
9. Dipterus (Ctenodus) cf. flabelliformis 
(r). 
Zones 90 to 95 of Gulf Brook section (1455 A). — These zones contain 
few fossils. No collections were made from them. 
