File:The Quarterly journal of the Geological Society of London (13860231484).jpg

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OP A PART OP COSTA EICA.
329
the peninsula of Punta Arenas, owing to the strong south-west cur-
rent in the Bay of Nicoya bringing all the sands from the rivers
Rio Grande, Jesus Maria, and Rio Barranca, all of which rivers
bring down with them the decomposed igneous rocks from the
Costa-Rican Andes and its spurs. However, the peninsula is being
cut away in the south by the current, as is proved by the trees
lately overturned.
Fig. 2. — Sketch Plan of the Peninsula of Punta Arenas.
a. Fine Sand.
b. Consolidated Volcanic Ash.
On crossing the Rio Barranca, and proceeding as far as the vol-
canoes of Irazu and Turrialba (see Map, PI. XII.), and then on
to the old Indian settlement called Orosi, the rocks met with present
a great similarity in their structure. The general rock of the
district shows itself on both sides of the Rio Barranca after leaving
the sands of the Punta- Arenas peninsula, and continues for about
fifty miles in an easterly direction towards Cartago, the ancient
capital of the country, although on the Aguacate range of mountains
rocks of volcanic origin make their appearance. The same general
rock is also found beyond Cartago, in the direction of Orosi. The
rock is fine-grained, presenting a greenish appearance

and wherever
it is not weathered it is tough and difficult to quarry. It has a
granular base, and contains crystals of triclinic felspar with augite,
also small quantities of magnetite

specimens obtained on the moun-
tain-range of Aguacate, near the gold- and silver -mines, show specks
of pyrites, and may be regarded as a consolidated volcanic ash.
The specimen collected near the Rio Barranca was more coarsely
fragmental than those collected in the mountains further in the
interior, and the felspars Avere more weathered (Appendix, No. 8,
p. 339).
On the south-east side of the Rio Barranca, before the village of
Esparto is reached, large boulders of a black rock are frequently
seen. They were examined, but were evidently strangers to this
particular locality. From Esparto to San Mateo the country is
rugged and mountainous, the surface being cut up by a

continuous
Date
Source https://www.flickr.com/photos/biodivlibrary/13860231484
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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36936122
Item ID
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113692 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 329
Names
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NameFound:Nicoya NameConfirmed:Nicoya EOLID:12168282 NameBankID:4567178 NameFound:Turrialba NameConfirmed:Turrialba NameBankID:5142375
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/36936122
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 38 (1882).
Flickr tags
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Flickr posted date
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15 April 2014
Credit
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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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This image was originally posted to Flickr by BioDivLibrary at https://flickr.com/photos/61021753@N02/13860231484. It was reviewed on 26 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

26 August 2015

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current07:10, 26 August 2015Thumbnail for version as of 07:10, 26 August 20151,233 × 2,056 (533 KB) (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13860231484 | description = OP A PART OP COSTA EICA. <br> 329 <br> the peninsula of Punta...

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