73 NOTES ON (iEOF.OOY AND BOTANY OF DK.'hV NKCK — UAII-KY 



Tlio traps, which form hy tar the lar<:f('st and most cons}>ic- 

 uousoh'mont in tht! structure of Di^'hy Neck, have hecu (K'scrihed 

 as vai'ied, hut tiu» div(»rsity which is seen is Ano i-ather to mere 

 variations of colour and texture than to any essential diH'erence 

 of composition. And these variations seem to recur without any 

 definite order, the colour even within a few yards often shadinrj 

 off from grey, the prevailing tint, to green oi- jiurjilish, while 

 both in the coastal dirt's an<i in the interior compact or columnar 

 trap is associated very irregularly with l)eds which are scori- 

 aceous or amygdaloidal. A good opportunity for tiie study of 

 these rocks is to be ha<l at Oulliver's (.'ove, to tiie north of the 

 sandstone section described above, here forming dirt's in souie 

 places 100 feet high. They exhibit layers dipj>ing at a slight 

 angle towards the Bay of Fundy, and are intersectec^ by vertical 

 veins from mere streaks to 4 or 5 inches in width. These 

 consist of various silicious minerals, while those occupying the 

 horizontal fissures appear to be chieHy zeolitic. The vertical 

 veir.s have a strike about NNE, (magnetic). 



Other good exhibitions, especially of the columnar structure, 

 may be seen about Digby Light and Brojul Cove ; bnt none are 

 so remarkable as those artbrded hy the depro.ssions of Sandy 

 Cove and the Petite Passage. This latter truly wonderful gap, 

 of which the northern entrance is shown in Plate VI, throU};h 

 wdiich rtows alternately a tidal current nearly 100 feet deep, 

 and with a velocity at times of not less than 8 knots, is upon 

 its western side, above the little fishing village of Tiverton, 

 bordered and overlooked b}' beetling dirt's, of which the indivi- 

 dual columns are most complete, and so carved by the sea as to 

 exhibit in places all the aspects of human architecture. The 

 boldness of the scenery is here further enhanced by the occur- 

 rence of numerous large blocks of trap, often 20 oi* 30 feet in 

 diameter, and of grotesque sha])es, wliich are perched, sentinel- 

 like, upon the very e^lge. of the blurt's, more than 100 feet 

 above the water. These, if not " boulders of decomposition," 

 must have been derived from the trappean ridges which, though 

 now invisiV)le through .submergence, are known to lie along the 

 Bay of Fundy trough, outside of but parallel to the present coast. 



