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Fossil Diversity

Fossil Diversity

We don't have to look too hard to find fossils in Kilim's limestones and detrital rocks.

Fossils are commonly found in Kilim's limestone and detrital rocks. Whether in the shape of moulds, casts, traces or imprints, these fossils are history books narrating the story of the Setul and Singa Formations from 505 to 286 millions years ago.

Kilim's fossil diversity includes:

  • Ancestors of modern insects (trilobites)
  • Snails and slugs (gastropods)
  • Lamp shells (brachiopods)
  • Sea mosses (bryozoans)
  • Precursors of the octopus and nautilus (chepalopods)
  • Clams (bivalves, extinct marine plankton (graptolites)
  • Sea-lilies (crinoids) and corals (cnidarians)

These fossils commonly occurred in its original shell forms imbedded in fresh limestone. Sometimes they occurred as iron oxides, a replacement material resulted from the oxidation process when the impure limestone were exposed to the surface.

A gastropod fossil embedded in the limestone at Anak Tikus Island.
More gastropod fossils at Anak Tikus Island.
A brachiopod fossil, Spirelytha petaliformis, found at Sungai Itau Village.
Graptolite fossil is an ancient marine invertebrate found at Mempelam Bay.
A bivalve fossil, Posidonomya sp., found in the red sedimentary rock at the northern part of Langgun Island.

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