Cartes géologiques et topographiques, leur interprétation et leur utilisation, un manuel pour le géologue et l'ingénieur civil . ny districts qu'il est impossible pour lui de visiter, et l'aidera plus que toute autre partie de l'hiswork dans l'acquisition de cet oeil pour un pays sans quelconques géologie est impossible. Comme les méthodes d'interprétation ont déjà été décrites, il ne reste qu'à indiquer comment les variouspices de l'information obtenue de la carte peuvent être reliés ensemble pour former un historique du district. Ceci sera obtenu en donnant quelques exemples (Fig. 71-77), qui sont aussi des inte

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Geological and topographical maps, their interpretation and use, a handbook for the geologist and civil engineer . ny districts which it is impossible for him tovisit, and will assist him more than any other part of hiswork in acquiring that eye for a country without whichsuccessful geology is impossible. As the methods of interpretation have already beendescribed, it only remains to indicate how the variouspieces of information obtained from the map may be linkedtogether to form a history of the district. This will bestbe accomplished by giving a few examples (Figs. 71-77), which are also intended to serve as diagram maps forpurposes of practice. The student should attempt todraw his own sections before consulting those given, andto supplement these by others drawn in different directions. The order of superposition of the strata is given inmost cases, but this is unnecessary, as it can be deducedfrom the arrows. Figure 71. (1) Order of Superposition of Beds. The oldest bed, m, occurs in the north-west cornerof the area, and is again brought to the surface in the 90 GEOLOGICAL HISTORY FROM MAPS 91. Fig. 71. 92 GEOLOGICAL AND TOPOGRAPHICAL MAPS core of the anticline, which runs from north-east tosouth-west across the centre of the district. The otherrocks exposed in ascending order are n, p, and r (2) Folds. The country has been folded along a north-east tosouth-west axis, the anticline and synclines shownbeing of the symmetrical type, and forming a series ofgentle undulations. (3) Physical Geography. The country has been considerably denuded sub-sequent to the movements, as the synclines form thehigh ground, while the central valley (X) occurs onthe anticlinal axis. The two synclines at Y and Z form the principalwatersheds of the district. The large river rises near the centre of thesynclinal area Y and flows into the anticlinal valleyX, where it receives several tributaries. It thencuts through the escarpment formed by the bed n, forming a gorge, and later is joined

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