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  1. Shale - Wikipedia

  2. Shale: Sedimentary Rock - Pictures, Definition & More - Geology.com

  3. Shale: Composition, Formation, Uses, Types – Geology In

  4. Shale | Properties, Composition, Formation, Uses - Geology Science

  5. Shale | Formation, Composition, Sedimentary | Britannica

  6. Marcellus Formation - Wikipedia

  7. Shale: Identification, Characteristics, and More

  8. Shale Rock: Geology, Composition, Uses - ThoughtCo

  9. Shale geology: characteristics, formation, uses - ZME Science

  10. Shale | Geophysical Monograph Series - AGU Publications