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Gredas de Bolnuevo

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Hidden : 6/22/2009
1 out of 5
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Geocache Description:

La 'Ciudad Enchantada de Bolnuevo' - The 'Enchanted City of Bolnuevo'.

La 'Ciudad Enchantada de Bolnuevo', o 'Gredas de Bolnuevo', está formada por margas arenosas o gredas de color amarillento, areniscas y, en menor medida, for finas lentejones de microconglomerados. Las areniscas presentan cantos carbonatados de color gris azulado y differente macrofauna de moluscos (Pecten, Flabellipecten, Amusium, Ditrupa), equidermos (erizos), y crustáceos (Balanus). Las gredas, según los estudios de Franciso Serrano, han aportado abundantes microfósiles (foraminiferos bentónicos y planctónicos, como Globorotalia margaritae o Globigerinoides obliquus extremus) que datan al Zancliense (Plioceno inferior; unos 4 milliones de años). Estas rocas, que presentan diferentes grados de cohesíon, han sufrido un proceso de erosíon diferencial, en el que el agua y el viento (este último es el responsable de la erosíon alveolar en 'nido de abajas' que se observa en algunos estratos de areniscas) han sido los agentes fundamentales de dicho proceso. Todo ello ha dado lugar a caprichosas formas micóticas de gran belleza.

Para signar, primero envio email con las respuestas a y segundo signar con photographico de las gredas y tu:

  • ¿Que signifca 'paleocanals'?
  • ¿En qualquier periodo geologico sera la ultima distensíon?

The 'Enchanted City of Bolnuevo' or 'Gredas de Bolnuevo' is made up of sandy loams or yellowish sandstones, and to a lesser extend of fine lentil-shaped microconglomerates. The sandstones have carbonated edges of a bluish-grey colour and a different mollusc marcofauna (Pecten, Flabellipecten, Amusium, Ditrupa), equinoderms (sea urchins), and crustaceans (Balanus). The Gredas, according to the studies of Francisco Serrano, have contributed abundant mircofossils (bentonic and planktonic foraminifera, such as Globorotalia margaritae or Globigerimoides obliquus extremus) wich date from the Zanclien sub-period (the lower Pliocene, sone 4 million years ago). These rocks, which show different degrees of cohesion, have suffered a differential erosion process in which water and wind have been essential agents. Wind is responsible for alveolar erosion in 'honeycombs' that can be observed in some sandstone strada. All tihs has given rise to capricious micotic shapes of great beauty.

To log, first email the answers to the following questions to and afterwards log with a picture of you and the Gredas:

  • What are 'paleocanals'?
  • In which geological period was the last relaxation?

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