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El Ilson chert

Material name: El Ilson chert
Synonyms: N/A
Material (geologic): Early Cretaceous (Aptian/Lower Bedoulian-Middle Albian) flint/chert

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El Ilson
Locality: El Ilson, Cantabria
Synonyms: N/A
Geographical description: Exposure in mountainous terrain around 209 m asl.
Topographical map 1:25 000 60-II La Iglesia.
Geological map 1:50 000 60 Valmaseda (1978) 20-05.

Length of identified source area: approx. 50 meters.
Thickness of chert bearing layers: approx. 15 meters.
Type of source: primary.

Geographical co-ordinates: Lat. 43° 18' N
Long. 003° 15' 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.
Other information: Exposure at El Ilson
Photo: John Rissetto, 2007.
  Chert embedded in Limestone
Photo: John Rissetto, 2007.
Sample description: Host Rock according to the 1:50 000 map from the Instituto Geologico Y Minero de España (IGME) (Spanish - English)
C 0-2, 15-16 - Calizas con Rudistas y Orbitolinas, areniscas en la base - Limestones with Rudists and Orbitolinas with sandstones at the base

Chert quality: low.
Form of nodules: amorphous.
Maximum dimensions of nodules: 20 cm.
Fracture pattern: conchoidal with fractures along longitudinal planes.


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