Neha Patil (Editor)

Geology of Singapore

Updated on
Edit
Like
Comment
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit

Igneous rocks are found in Bukit Timah, Woodlands, and Pulau Ubin island. Granite makes up the bulk of the igneous rock. Gabbro is also found in the area and is found in an area called Little Guilin, named for its resemblance to Guilin in Southern China. This area is in Bukit Gombak. Sedimentary rocks are found on the western part of Singapore, and is mainly made of sandstone and mudstones. It also includes the southwestern area. Metamorphic rocks are found in the northeastern part of Singapore, and also on Pulau Tekong, off the east coast of Singapore. The rocks are mainly made up of quartzite, and also make up the Sajahat Formation.

Specific areas

The following are the list of local geology:

  • Kallang Formation:
  • Tekong Formation: Unconsolidated marine and littoral well sorted sand with minor pebble beds and wood.
  • Huat Choe Formation: A lacustrine deposit containing white kaolin clay and minor quartz gravel.
  • Old Alluvium: Terrestrial to deltaic loose coarse quartz-feldspar sand and gravel, and lightly cemented sandstone-conglomerate. The top 8 metres are usually deeply weathered.
  • Fort Canning Boulder Bed: Late Cretaceous colluvial deposit of strata from Rimau and possibly Queenstown Facies
  • Jurong Formation:
  • Dyke Rocks: Igneous rocks intruded into the Palaeozoic Formations and Bukit Timah Granite. Dykes are grouped as Acid Dykes and Basic Dykes. Within the acid dykes granophyre, trachyte, and granite porphyry, and within the basic dykes, dolerite, and spessatite have been mapped.
  • Bukit Timah Granite: The granite varies from granite through adamelilite to granodiorite, and several hybrid rocks are included within the formation. Both hornblende-rich granite and biotite-rich granite occur. Zones of norite-granite mixed rocks are also seen. Hybrid granodiorite is also recognised.
  • Palaeozoic Volcanics: Andesitic ashy tuff and agglomerate tuff.
  • Gombak Norite: Gabrroic and noritic rock. Shows metasomatic formation close to the Bukit Timah Granite.
  • Sajahat Formation: Well lithified quartzite, quartz sandstone, and argilite.

    • References

    Geology of Singapore Wikipedia
    (Text) CC BY-SA