File:The Quarterly journal of the Geological Society of London (12961211695).jpg

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340
PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. .JuDO 9,
formation obtained from Dr. Plassard, who was at Caratal while
this stuff was being worked.
Fig. 3. — /Section of Alluvial Digging near Nueva Providencia.
24-ft :-::
The following is the succession of the beds : —
1. Soil.
2. Red clay, showing no signs of stratification.
3. Soft clayey " moco de hierro."
4. Hard " moco de hierro," brown iron ore, with pieces of quartz
in it and a httle clay.
5. Blocks of vein-quartz, often auriferous.
6. "Greda," or pay-dirt, a yellow ferruginons clay containing
nuggets and small grains of gold.
7. " Cascajo," decomposed schist, forming the " bed-rock."
About half a mile from the town, on the road to Tupuquen, are
the " Planada" diggings, said to have been worked with much profit
in 1857. The section of one of the Planada pits is as follows : —
1. Soil.
2. Clayey gravel.
3. Blocks of quartz.
4. " Greda," or pay-dirt.
5. " Cascajo," the bed-rock.
In a neighbouring pit I saw about 6 feet of clay and then 6 feet
of gravel, the bottom being filled with rubbish. The pebbles found
in the gravel are mainly composed of the greenish grey felstone,
known as " piedra negra ; " subangular and rounded pieces of ferru-
ginons hornstone are also common. Higher up the valleys the placer
diggings are shallower.
3. Tierra de Flor and Moco de Hierro. — In many places in the

Caratal district, just below the soil, at a depth of 18 inches to 3 feet,
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Source https://www.flickr.com/photos/biodivlibrary/12961211695
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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36103201
Item ID
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111288 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 340
Names
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NameFound:Providencia NameConfirmed:Providencia EOLID:97438 NameBankID:2557960
BHL Page URL
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https://www.biodiversitylibrary.org/page/36103201
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 25 (1869).
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Flickr posted date
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6 March 2014
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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26 August 2015

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