Geotechnical Crossword

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Across
  1. 1. Fancy word for layers of sedimentary rock
  2. 5. Softest rock on earth is this type
  3. 6. Poorly graded sand with silt (USCS)
  4. 7. The oldest rock on earth is this type
Down
  1. 1. Tool for sorting soil by size
  2. 2. Considered the father modern-day soil mechanics
  3. 3. Small, plate-shaped soil particles
  4. 4. The name of this rock type is derived from the latin word for "fire"