File:Geomonumento do Rio Seco - Lisboa - Portugal (52070710746).jpg

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No início do Cretácico superior o nível global dos oceanos subiu e o mar invadiu grande parte das terras emersas até então. A atual região de Lisboa não escapou a este fenómeno à escala planetária.

Era um mar pouco profundo, de águas quentes e límpidas, propícias à proliferação de organismos produtores de esqueleto (conchas) de natureza calcária.

Desses organismos destacam-se os RUDISTAS, lamelibrânquios (moluscos) coloniais, construtores de bancos recifais, aqui testemunhados pelas camadas de calcário do período CRETÁCICO.

Foi este calcário, em algumas ocorrências conhecido por lioz, que assegurou, ao longo dos séculos, o essencial da alvenaria, da cantaria e da estatuária de Lisboa. Nesta pedreira os calcários foram também explorados para o fabrico de cal.

Curiosidade: Neste local, há 97 milhões de anos, era mar. <a href="https://informacoeseservicos.lisboa.pt/contactos/diretorio-da-cidade/geomonumento-do-rio-seco" rel="noreferrer nofollow">informacoeseservicos.lisboa.pt/contactos/diretorio-da-cid...</a>
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Source Geomonumento do Rio Seco - Lisboa - Portugal 🇵🇹
Author Vitor Oliveira from Torres Vedras, PORTUGAL
Camera location38° 42′ 23.5″ N, 9° 11′ 37.09″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This image was originally posted to Flickr by Portuguese_eyes at https://flickr.com/photos/21446942@N00/52070710746. It was reviewed on 18 May 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0.

18 May 2022

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current19:33, 18 May 2022Thumbnail for version as of 19:33, 18 May 20222,048 × 1,365 (2.92 MB)Tm (talk | contribs)Transferred from Flickr via #flickr2commons

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