Question

Which of the following rocks is not likely to contain fossils?
1. Conglomerate
2. Granite
3. Shale
4. Sandstone 

Answer 1

Correct Answer - Option 2 : Granite

The correct answer is Granite.

• Fossils, the preserved remains of animal and plant life, are mostly found embedded in sedimentary rocks.
• In sedimentary rocks, most fossils occur in shale, limestone, conglomerate, and sandstone.
  • Sedimentary rocks look like layered pancakes.
• Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye.
  • It forms from the slow crystallization of magma below Earth's surface.
  • Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other minerals.

• Conglomerates form by the consolidation and lithification of gravel. They can be found in sedimentary rock sequences of all ages.
• Shale is a fine-grained sedimentary rock that forms from the compaction of silt and clay-size mineral particles that we commonly call "mud".
• Sandstone is a sedimentary rock composed mostly of quartz sand, but it can also contain significant amounts of feldspar, and sometimes silt and clay.
  • Sandstone that contains more than 90% quartz is called quartzose sandstone.
  • Sandstone contains more than 25% feldspar, it is called arkose or arkosic sandstone.