coal measures /ˈkəʊl ˌmeʒəz/ rocas carboníferas [estratos del período carbonífero] The rich organic matter deposited is the origin of the numerous coal measures.
carboniferous /ˌkɑːbəˈnɪfərəs/ carbonífera fern-like fronds found in carboniferous rocks
granitic /grænˈɪtɪk, grəˈnɪt-/ granítica Granitic rocks melt at about 650-700 degrees Celsius.
igneous /ˈɪgniəs/ ígnea We crossed an expanse of igneous rock, red, potholed and uneven.
sedimentary /ˌsedɪˈmentəri/ sedimentaria Mining corporations are interested in probing beneath the sedimentary rocks to find new deposits.
metamorphic /ˌmetəˈmɔːfɪk/ metamórfica The team discovered more metamorphic rocks along a different stretch of the Red River fault.
calcareous /kælˈkeəriəs/ calcárea a layer of calcareous rock
porous /ˈpɔːrəs/ porosa The bizarre, dreamlike landscape was formed by soft, porous rock from volcanic activity and eroded by the elements.
volcanic /vɒlˈkænɪk/ volcánica The Romans constructed the temple mainly from local volcanic rock that they then faced with marble.
