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#crater rim
#volcano rim
#edge
#caldera
#geological formation
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#conglomerate rock
#sedimentary rock
#pebbles
#clastic rock
#geological formation
#matrix
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#sedimentary rock
#mudrock geology
#clay
#silt
#wet rock
#geological formation
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#slow hardening
#mineral deposit
#limescale buildup
#geological formation
#stalactite
#stalagmite
#set over time
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#ampthill clay
#geological formation
#fossil analysis
#palaeontology
#sedimentary geology
#jurassic stratigraphy
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#mineral nodule
#geological formation
#rock nodule
#manganese nodule
#geode
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#hell creek formation
#USA paleontology
#montana paleontology
#south dakota paleontology
#north dakota paleontology
#wyoming paleontology
#geological formation
#tyrannosaurus rex
#late cretaceous
#crater rim #volcano rim #edge #caldera #geological formation