oe ees Geology, Sc. of the Connecticut. 
This appears to be a real chalcedonyx ; and such mga 
are not uncommon. 
‘No.6 Fortification and Eyed Agatta, in the same speci- 
men. bn of the latter is an inch in diameter, and has six 
or seven zones of lighter and. darker chaleedony and one of 
carnelian, enveloping a nucleus of light blue chalcedony. 
daloidal, but contains ae a few large cavities; anid so firm- 
ly are the agates fastened into their bed that one is often 
obliged to break them out by piecemeal; thus ruining the 
most superb specimens. The largerones are not very abun- 
dant. The rock, however, has not been penetrated very 
ar. : ‘ 
20. Siliceous Sinter: At East-Haddam, in gneiss and in- 
crusting mica slate. (7. D. Porter and Webster.) 
- Opal. “Common opal has been found i in. Litchfield, 
eee rarely.” (Brace é.) 
22. Flint. Near New-Haven oe ‘in Woodbridge i in roll- 
ed masses. (Sidliman.): 
i Hovnstoni. At Litchfield. Ebves. ) At the Soman 
ton eer mine; also in Conway. Also in greenstone at 
Southington and Deerfield. At the latter place it oceurs in 
nodules often four or five inches in diameter. Its colors are 
grey, green, black with a tinge of red, and dark blue. Its 
fracture is sometimes a little chonchoidal and glistening, 
sometimes dull and splintery ; and it is scarcely translucent 
atthe edges. Some specimens considerably resemble sili- 
ceous slate, and others appear like prase. But Professors 
Silliman and Dewey <the latter of whom has examined it 
chemiecally,) agree in calling it hornstone. Also in Sunder- 
land in greenstone, in narrow veins—well characterised. 
24. Jasper. Near New-Haven in rolled masses. (Gibbs.) 
Also at Cummington on the banks of Westfield river. (J- 
Porter.) Also on'the banks of Deerfield river in Deerfield, 
