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Are they not for the most part the records of the misapprehensions of the misinformed? Let us congratulate ourselves that in this flight through the Provinces we have not attempted to do any justice to them, geologically, economically, or historically, only trying to catch some of the salient points of the panorama as it unrolled itself. Will Halifax rise up in judgment against us?
Then, to account for the presence of a Spanish flora in the west of Ireland, a bold hypothesis, started by Professor Edward Forbes, is put forward 'that the west of Ireland was geologically united with the north of Spain; admitting which, there is no difficulty in supposing the plants to have travelled along the intervening land, which has subsequently disappeared, and that, owing to climatic changes, the hardier sort of plants, such as saxifrages and heaths, have alone survived.
Also it is possible to explain this phenomenon geologically, because here in this region is the southern edge of the coal deposits which are the source of carbonic acid and swamp gases. Not far from the ruins in the lands of Hun Doptchin Djamtso there is a small lake which sometimes burns with a red flame, terrifying the Mongols and herds of horses. Naturally this lake is rich with legends.
Chalk and clay and sandstone stretch continuously under sea from Kent and Sussex to Flanders and Picardy. The Channel burst through, and made the Straits of Dover; but the land on either side was and still is geologically and physically identical. What has made the difference? Man, the planter and gardener.
The valley of the Somme in Picardy, alluded to in the last chapter, is situated geologically in a region of white Chalk with flints, the strata of which are nearly horizontal. The Chalk hills which bound the valley are almost everywhere between 200 and 300 feet in height.
Well, it was better to talk of that than nothing; at least, it kept Harry from his childish cries for Desiree. So I explained that the precipice over which we had fallen was presumably of recent origin. Geologically the Andes are yet in a chaotic and formative condition; huge slides of Silurian slates and diorite are of frequent occurrence.
From the Dover strait westward there is a gradual lowering of the incline, though of course with such variations and undulations as we find on the emerged plains; but the existence of this vast submarine basis must cause us to think of our island, naturally and geologically, as a true part of the great European continent, rendered insular by the comparatively recent intrusion of shallow and narrow waters.
Incidentally the discovery tended to show that this fauna had lasted much later in South America than was the case with the corresponding faunas in other parts of the world; and therefore it tended to disprove the claims advanced by Doctor Ameghino for the extreme age, geologically, of this fauna, and for the extreme antiquity of man on the American continent.
All of this various strata of rock and sand belongs, geologically speaking, to what is known as the lower silurian system, extending from near the western shores of Lake Michigan, and sweeping over all the lower half of Minnesota, westward and upward along the valley of the great Red and Assinniboin Rivers to the north, marking one of the most prolific grain growing belts on the continent, if not in the world.
The terminal moraine, which is the one that closed up the lake, separating and raising it above the level of Lake Tahoe, is a less noble mound, yet geologically it allures the mind and demands study as much as the others. Joseph LeConte's theories are given in full explaining the various glacial phenomena connected with this lake.
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