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Castillo de Portilla

Material name: Castillo de Portilla
Synonyms: N/A
Material (geologic): Paleogene (Lower Eocene) chert

Castillio de Portilla chert
Photo: John Rissetto, 2007

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Castillo de Portilla
Locality: Castillo de Portilla, Álava, Spain
Synonyms: N/A
Geographical description: Exposure in mountainous terrain around 742 m asl.
Topographical map 1:25 000 138-III Treviño.
Geological map 1:50 000 138 La Puebla de Arganzon (1976) 22-08.

Length of identified source area: approx. 450 meters.
Thickness of chert bearing layers: approx. 30 meters.
Type of source: primary.

Geographical co-ordinates: Lat. 42° 40' N
Long. 002° 50' W
(Mapdatum WGS 84)
Co-ordinate precision: The coordinates are given to the nearest minute. If you need more detailed information about this location, please contact the author.
  Flake of chert
Photo: John Rissetto, 2007
length: 34 mm.
Sample description: Host Rock according to the 1:50 000 map from the Instituto Geologico Y Minero de España (IGME) (Spanish - English)
T, Aa, 21-22 - Dolomías y calizas dolomíticas - Dolomite and dolomitic limestone

Chert quality: low.
Form of nodules: amorphous.
Maximum dimensions of nodules: 25 cm.
Fracture pattern: conchoidal.


Last modified on:
December 13, 2007
Contents primarily by:
John Rissetto
Comments to: