MAKE A MEME
View Large Image
| View Original: | Plan_paris_gerards1908_jms.jpg (2237x1765) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: Plan paris gerards1908 jms.jpg Map of Paris' underground mine exploitations by Emile Gérards published 1908 <br /><br /> 95C957 Underground gypsum exploitations F1A18A Underground limestone exploitations Map drafted by Émile Gérards<br /> 1908<br /> Scale 1 60 000 Limite extrême de la formation de gypse exploitable Extreme limit of exploitable gypsum deposits<br /> Limite de la zone exploitable du calcaire grossier Exploitable limestone deposit zone limits<br /> Zone d'erosion et de brouillage Erosion zone having no distinct geological formations<br /> 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 <br /> 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 own Plan Émile Gérards 1859 “1920 http //catalogue bnf fr/ark /12148/cb12233342w/PUBLIC BnF Notice d'autorité personne <br />Digital copy ThePromenader Plan PD-old-auto-1923 1920 Digital copy cc-by-sa-3 0 Uploaded with UploadWizard Maps of Paris in the 20th century 20th-century maps of Paris 1908 in Paris Quarries in Paris | ||||
