[MATTHEW] GEOLOGICAL AGE OF THE LITTLE RIVER GROUP 73 



of Maine, and determined that they indicated an Upper Devonian age. 

 Since then Mr. David White has revised this flora, described additional 

 species and confirmed the reference of the flora to the Upper Devonian. 



Now this terrane extends across the border into New Brunswick, 

 and is seen both in Maine and New Brunswick to rest on Silurian rocks. 

 The terrane extends in patches and limited areas across Charlotte County, 

 in New Brunswick, along the borders of the Bay of Fundy until it trans- 

 gresses upon the tilted strata of the Little Eiver group at Lepreau, rest- 

 ing on them unconformably. There is then a break of about fifteen miles 

 to where it re-appears in the valley of the Kennebecasis, here resting 

 upon Pre- Cambrian metamorphic rocks; farther east in this valley it 

 rests at low angles on highly tilted Cambrian strata. The terrane here 

 is much thicker and more diversified in the sedimentation than at Perry. 

 It consists largely of red sandstones and shales, which are divided by a 

 central member of gray sandstones and shales, with numerous remains of 

 land plants and a few of fishes. Traced eastward this gray member 

 proves to be the western phase of the Albert shales, a richly bituminous 

 deposit. The plant-remains here are also of an Upper Devonian facies, 

 but of a different type from those of Perry which (though contained in 

 layers that are gray) belong to a red member of the series, and probably 

 underlie the gray member above described. 



Though this Upper Devonian terrane in the Kennebecasis valley 

 does not overlie the Little Eiver terrane which is absent from this valley, 

 an outlier of the former terrane is found in the next valley south, where 

 at Red Head, on St. John Harbour, the outlier is seen to rest on the up- 

 turned edges of the higher beds of the Little Eiver terrane. 



A significant feature of this overlying Devonian terrane is that the 

 measures almost everywhere dip to the northward at comparatively low 

 angles, while the underlying Silurian and Little Eiver terrane have 

 measures which dip at high angles to the southeast. The strata in place 

 of being folded in sharp folds like those of the Little Eiver group are 

 divided into blocks by uplifts along fault lines, the strata in each block 

 dipping northward. 



The conglomerates of this terrane abound with boulders and pebbles 

 derived from the old Laurentian and Huronian ridges, the parent ledges 

 having been brought to the surface by the earth movements in Middle 

 Devonian Time, connected with the extrusion of the granitic masses to 

 the north. 



Every feature of the geological structure points to the great anti- 

 quity of the Little Eiyer terrane, and show it to be related to deposits 

 preceding rather than to those succeeding the extrusion of the Devonian 

 granites. 



