English geology mnemonics

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To fall in love is easy, even to remain in it is not difficult; our human loneliness is cause enough. But is a hard quest worth making to find a comrade through whose steady presence one becomes steadily the person one desires to be.
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Here are some English mnemonics related to geology.

Stalagmites come from the ground, while stalactites come from the ceiling.

The middle periods are Precambrian, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous:

  • Pregnant Camels Ordinarily Sit Down Carefully. Perhaps Their Joints Creak

The Cenozoic periods are Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, Holocene:

  • Possibly Early Oiling Might Prevent Poor Health
  • Put Everything On My Pants Please Hannah
  • Put Eggs On My Plate Please Honey.

Moh's scale of hardness:

Talc, Gypsum, Calcite, Fluorite, Apatite, Felspar, Quartz, Topaz, Corundum, Diamond.

An easy way to remember the names of these minerals in their order of hardness is: Two German Colonels Fired A French Queen To Cause Death.

Wikipedia has an article about:

List from the Geological Society of London