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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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The author died in 1920, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

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