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Limestone pavements - DP/EC134 EarthCache

Hidden : 5/22/2018
Difficulty:
1.5 out of 5
Terrain:
3.5 out of 5

Size: Size:   other (other)

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Geocache Description:


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In geology, intersecting “lines” give rise to interesting patterns. When these lines are associated with pronounced erosion, the features developed are more and more striking.

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Em geologia, linhas cruzadas dão origem a padrões interessantes. Quando essas linhas estão associadas a erosão pronunciada, as características desenvolvidas são ainda mais marcantes.

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Clints and Grykes:

Are typically formed by the intersection of two predominant orientations of “lines”. In this case, fractures.

Pavements are made up of two separate but integral parts known as clints and grykesClints are the blocks of limestone that constitute the paving, their area and shape is directly dependant upon the frequency and pattern of grykesGrykes are the fissures that isolate the individual clints.

The term “Pavements” stems from the  a natural karst landform consisting of a flat, incised surface of exposed limestone that resembles an artificial pavement. The term is mainly used in the UK and Ireland, where many of these landforms have developed distinctive surface patterning resembling paving blocks. Similar landforms in other parts of the world are known as alvars.

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Clints e Grikes:

São tipicamente formados pela intersecção de duas orientações predominantes de “linhas”. Neste caso, fracturas.

Pavimentos são compostos de duas partes separadas, mas integradas conhecidas como clints e grykes. Os clints são os blocos de calcário que constituem o pavimento, sua área e forma dependem directamente da frequência e do padrão de grykes. Grykes são as fissuras que isolam os clints individuais.

O termo “Pavimentos” deriva de uma forma de relevo cársico natural que consiste de uma superfície plana e incisa de calcário exposto que se assemelha a um pavimento artificial. O termo é usado principalmente no Reino Unido e na Irlanda, onde muitas dessas formas de relevo desenvolveram padrões distintos de superfície que se assemelham a blocos de pavimentação. Estas formas geomorfológicas similares noutras partes do mundo são conhecidos como alvars.

 

According to the published 1:50000 geological map, number 26-C (Peniche), the limestones outcropping on site are Kimmeridgian age (152.1 (+/- 1) million years ago - 157.3 (+/- 0.9) million years ago; Jurassic) (See below). Segundo a Carta 1:50000 26-C (Peniche), publicada pelos Serviços Geológicos de Portugal (1960), afloram no local, as “Camadas de Abadia” do Kimmeridgiano (152.1 (+/- 1) M.a. - 157.3 (+/- 0.9) M.a.; Jurássico) (Ver infra).

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How to register this EarthCache:

Go to the published coordinates (careful about the tides/waves) and answer the following questions:

  1. There are two main orientations of the grykes (the fissures). What are they?
  2. Are the orientations constant at the GZ? Or do they change? (compare for example with the area 50m to the east)
  3. How deep (average) are the grykes (the troughs) at the GZ?
  4. What is the typical shape of the clints? (square, rectangle, triangle or in between)
  5. Do the grykes have linear continuity over more than one block? In which direction/orientation? If they do, ignore question 6
  6. Considering that the answer to question 5 is negative, how far can you measure a grike before it is offset?

Send all the answers through my profile before logging the cache. Thanks.

Como registrar esta EarthCache:

Vai para as coordenadas publicadas (cuidado com as marés / ondas) e responde às seguintes perguntas:

  1.  Existem duas orientações principais dos grykes (as fracturas). Quais são?
  2.  As orientações são constantes no GZ? Ou variam? (compara por exemplo com a área 50m a leste)
  3.  Qual a profundidade média dos grykes (as fracturas) no GZ?
  4.  Qual a morfologia típica dos clints (quadrados, retcângulos, triângulos ou irregulares)
  5.  Os grykes têm continuidade linear para além de um bloco? Em qual direção / orientação? Se assim for, ignora a pergunta 6
  6.  Considerando que a resposta à pergunta 5 é negativa, até onde (que comprimento) podes medir um gryke antes de ser desfazado?

Envia todas as respostas através do meu perfil antes de registrar a cache. Obrigado.


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