AND THE EEPORT ON THE GEOLOGY OF VERMONT. 115 



a limestone conglomerate or breccia, and Lingulella in the shales at the same jjlace. 

 My specimen of the head of Conoceplialites minuta was determined as snch, in 1881, 

 by Mr. Whitfield, and is at the American Museum of Natural History at New York. I 

 did not pay any attention, at the time of finding it (in 1862), as to what part of the sec- 

 tion it belonged; but it came from that place without a possible doubt. 



AVe must say that the Conoceplialites Adamsi, confined, for many years, to the single 

 locality of Church farm where it is generally found in loose pieces of very pinkish-red 

 sandrock, has been collected by Mr. Walcott in many other places, and seems to range 

 through at least fifteen hundred feet of magnesian limestone, slates and sandstone at 

 Highgate Spring and at Georgia. Until now, it is ceitainlj^ the primordial fossil which 

 possesses the greatest I'ange, carefully recorded, of all those found in the Taconic of 

 Vermont. 



Stratigraphically, the red sandrock is seen in such position at different jilaces, — foi* in- 

 stance, on the shoi-e of the lake at Highgate Spring, Highgate Falls, Swanton, St. Albans' 

 Bay and Shelburn Falls, that it left no doubt as lo its being an overlying formation 

 which, according to J. B. Perry, "in several instances, extends over almost the entire, if 

 not over the whole, width of the Taconic series of Dr. Emmons."^ 



The existence of lenticular masses of magnesian limestone and calcareous sandstone, 

 inclosed in the Georgia slates, is cei'tain from the observations of Mi'. Walcott at Park- 

 er's quarry and at Highgate Spring (Church and E. Stearns's farms). I shall add my 

 observations at Swanton, on the ground of Dr. Hall's farm, where I saw in 1862 the fol- 

 lowing section ; Plate 13, fig. 3. It began at the Missisquoi river, running east-east- 

 south, passing first at the small Sugar cabin' and then over the two lenticular masses of 

 blue and gray limestone. 



1. Sandy alluvial; 15 feet. 



2. Red sandrock, massive, passing to a red magnesian conglomerate; almost horizon- 

 tal, the dip being only 1° or 2° east. No fossils; .30 feet. 



3. From the Sugar cabin to the summit of tlie first hill an alternance of Georgia slates 

 with beds of gray, reddish and yellowish calcareous sandstone; about 200 feet. Dip 12° 

 to 15° east. Fossils: Olenellus Tlioinpsoni, Camerella antiquata, Conoceplialites, etc. 



4. A fii'st lenticular mass of a very hard blue limestone, brecciated, of only thirty feet 

 of diameter, containing a great quantity of fossils, more especially Obolella (^Kutorghui) 

 cinf/ulata, Ortliisina, Camerella and Conoceplialites. 



5. A little southeast, separated from No. 4 by black slates containing Olenellus 

 Thompsoni, Conoceplialites Teucer, etc., there is a second lenticular mass of another very 

 hard limestone, whitish-gray, with veins of carbonate of magnesia; containing also nu- 

 merous fossils: Olenellas Thoinpsoni, Conoceplialites Teucer, Kutorgina cingidata, etc. 

 The part that crops out is larger than at the first lentille and shows a diameter of fifty 

 feet. 



6. Black slates with soma bads of sandstone containing Palaeophycus. The slates are 

 cleaved and in some places I have seen a difference of 35" between the cleavage and the 

 stratification. The largest specimen of Olenellas Thompsoni I have ever seen was 

 found there and it shows finely the cleavage; it can be seen at the American Museum 

 of Natural History of New York, to which I have given some of my best specimens. 



' "Queries on the Red Sandstone of Vermout, etc.," p. G, Boston, 1868. 



