Showing posts with the label sedimentary rock

Siccar Point - the world's most important geological site and the birthplace of modern geology

Siccar Point  is world-famous as the most important unconformity described by James Hutton (1726-1797) in support of hi…

Banded-iron formations (BIFs) - Evidence of Oxygen in Early Atmosphere

Our knowledge about the rise of oxygen gas in Earth’s atmosphere comes from multiple lines of evidence in the rock reco…

Geologic Contacts

2. Intrusive contacts are those where one rock has intruded another 3. Fault contacts are those where rocks come into…