MUSEUM OF COMPARATIVE ZOOLOGY. 109 



trap in sandstone at contact ; two thin tufa beds a few feet above trap 

 sheet. See special account. 



Locality 9. Anterior to Cat Hole Peaks. Percival's Report, pp. 375, 376. 

 Two small openings in the anterior ridge east of the Meriden poor- 

 house, a mile and a half northwest of the city (Fig. 6), expose the lower 

 part of the sheet. It is generally of dense structure, but presents ex- 

 tremely irregular forms, as if consisting of ropy masses of flowing lava ; 

 the spaces between these masses are filled with a much weathered 

 loose material that may perhaps be lapilli ; there are numerous " spike " 

 amygdules (see special account of locality 13) near and at right angles 

 to the convex surfaces of the lava masses. The upper portion of the 

 same sheet, where seen on roads on the back of the ridge, locality 9', is 

 highly vesicular. 



Locality 10. Anterior of Notch Mountain. Percival's Report, pp. 375, 376. Perci- 

 val's notation, Ant. to E. IV. 1 (3). 



A hundred feet southwest of the Meriden puorhouse, the sandstone 

 appears a little above the trap of the anterior sheet to Notch Mountain 

 (Fig. 6) ; a small piece of vesicular trap was found in it. The same 

 anterior sheet, where exposed in the Eeservoir Notch, a third of a mile 

 to the west, is extremely vesicular in its upper part. 



Locality 11. Anterior to Shuttle Meadow Mountain.^ Percival's Report, 

 pp. 375, 376. Percival's notation. Ant. to E. IV. 1 (4). 



A few poor exposures in the road on the back of this anterior, half a 

 mile south of Shuttle Meadow Reservoir, reveal weathered fragments 

 of vesicular trap in the sandstone overlying the sheet. Some of the 

 vesicles in these fragments contain clastic deposits. 



Locality 12. Anterior to Farminprton Mountain. Percival's Report, pp. 375. Per- 

 cival's notation, Ant. to E. IV. 1 (9). 



An excellent exposure of this anterior is found about a mile east 

 of Farmington, directly north of Stetson's house (Fig. 7). Middle of 

 sheet dense ; bottom sparingly cavernous ; upper portion generally 

 sub-amygdaloidal to cavernous ; very vesicular at upper surface, where 

 numerous vesicles are filled with indurated bitumen ; ^ surface of sheet 

 very uneven, with sandstone conformably filling hollows and open vesi- 

 cles ; intimate mixture of trap fragmenfs and sand grains on upper 

 surface. 



1 Called "North High Rock" in Bull. Mus. Comp. Zool., 1889, No. 4, Fig. 13. 



2 Percival, Geol. Conn., 1842, p. 375. 



