Sediments and Sedimentary Rocks

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Chapter 7: Sediments and Sedimentary Rocks Assignments

Sedimentary Rocks Chart

Name: ______________________________________ Date: ____________________

Directions: Refer to the Chapter 6 PowerPoint where we discussed the various types of sedimentary rocks. Organize the rocks in this chart:

The detrital rocks are categorized by sediment size. You will list their additional features, composition, and rock names.
The chemical rocks are categorized by type. You will list their composition and rock names.

Detrital Sedimentary Rocks:

Chemical/Biochemical Sedimentary Rocks:

Struggling with where to start this assignment? Follow this guide to tackle your assignment easily!

Open Chapter 6 PowerPoint (or your textbook) where sedimentary rocks were introduced.
Make notes on detrital (clastic) rocks and chemical/biochemical rocks.

Detrital rocks are categorized by grain size. Use the chart as follows:

Gravel-sized particles (>2 mm)
- Features: Rounded (conglomerate) or angular (breccia).
- Rock names: Conglomerate, Breccia.
Sand-sized particles (0.0625–2 mm)
- Features: Quartz-rich or feldspar-rich.
- Rock names: Sandstone (Quartz Sandstone, Arkose, Graywacke).
Silt-sized particles (0.0039–0.0625 mm)
- Features: Fine-grained, smooth feel.
- Rock name: Siltstone.
Silt/Clay mix
- Features: Thin layers (laminated).
- Rock name: Shale.
Clay-sized particles (<0.0039 mm)
- Features: Very fine, smooth, compact.
- Rock name: Claystone.

These form from chemical precipitation or from biological activity:

Carbonates
- Composition: Calcite (CaCO₃).
- Rock names: Limestone, Dolostone.
Evaporites
- Composition: Minerals formed by evaporation.
- Rock names: Rock Salt (halite), Rock Gypsum.
Biochemical Rocks
- Composition: Remains of organisms.
- Rock names:
  - Coquina (cemented shell fragments).
  - Chalk (microscopic marine organisms).
  - Fossiliferous Limestone (contains visible fossils).
  - Coal (plant remains, carbon-rich).

Fill in the chart neatly with the details above. Use bullet points or concise phrases for features and composition.

Double-check that each sediment size or chemical type has the correct rock name.
Compare with the examples in your PowerPoint notes to ensure accuracy.
Keep your wording short and clear since it’s a chart format.