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Organic-rich sedimentary rocks

Sedimentary rocks with high amounts of organic material

Pronunciation
/ɔːˈɡanɪk - rɪʧ sɛdɪˈmɛntri rɒks/
/ɔrˈɡænɪk - rɪʧ ˌsɛdəˈmɛntəri rɑks/
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