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File:Plan paris gerards1908 jms.jpg

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Summary

Description

Map of Paris' underground mine exploitations, by Emile Gérards, published 1908.

English: Former Mines of Paris
English (en):
 
Underground gypsum exploitations
 
Underground limestone exploitations

Map drafted by Émile Gérards
1908
Scale: 1:60,000

Limite extrême de la formation de gypse exploitable : Extreme limit of exploitable gypsum deposits
Limite de la zone exploitable du calcaire grossier : Exploitable limestone deposit zone limits
Zone d'erosion et de brouillage : Erosion zone having no distinct geological formations
Courbes de niveau d'après les repères antérieurs à 1907 (à diminuer de 0m61) : Elevation curves based on pre-1907 markers (to be reduced by .61 metres)

Text : "The blue curves indicate the altitude at which the topmost extremity of the rock formation is generally exposed to the surface in the upper level of mine exploitations - This (limestone) deposit's thickness varies from .40 metres to 1 metre - The lower level of a (limestone) mine most often begins around 4 metres below the rock formation surface - Gypsum mine levels are too varied to be represented by curves"
Français : Anciennes carrières de Paris
Date
Source Own work
Author

Plan: Émile Gérards (1859–1920) BnF Notice d'autorité personne


Digital copy: ThePromenader

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