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 diminue
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' . 1908 64 Plan paris gerards1908 jms
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