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  • groundwater

  • natural springs

Lower Coralline Limestone

Formation

  • 140m deep

  • formed of corals and fossil algae called coralline algae

  • it was formed in shallow water

Blue Clay

Characteristics

  • pale grey

  • very hard

Characteristics

Uses

Formation

Special Feature

  • spalls

  • pavements and road surface

  • buildings
  • very fine particles

  • impermeable - water does not pass through it

Scutella bed

  • 20 - 70m deep

  • very fine grains

  • large quantities of particles from fossils prevented it from becoming solid rock

Special Feature

Uses

  • impermeability

Upper Coralline Limestone

Formation

Characteristics

  • very hard

  • forms cliffs
  • similar to LCL, but contains different marine fossils

  • more than 160m thick

special feature

Uses

forms terrarossa soil

  • spalls

  • soil

Greensand

Formation

  • rarely more than 1 metre thick if present at all

  • sand mixed with fossil remains

Characteristics & Special Feature

contains Glauconite, which is bright green when exposed to air or under a microscope, then it becomes yellow

Uses

None

fossils of large animals might be preserved

Globigerina Limestone

Uses

  • construction

  • sculpture

Special feature

Xwejni pebble bed

Characteristics

  • soft

  • yellowish

Formation

  • 20 to 200m deep

  • mostly fine grains

  • formed in deep water
  • named after a microscopically small fossil shell called globigerina
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