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Pyritisation is the replacement of original material by iron pyrites. The environment needs to be anaerobic, where the only live organisms are sulfur bacteria. This bacteria will then use the sulfur in th...
in nautiloids septal necks are retrosiphonate (point towards the protoconch / centre OR away from the aperture)in ammonoids septal necks are mainly prosiphonate (point towards the aperture OR away from th...
The law of superposition states that the oldest rocks in a stratigraphic sequence will be at the bottom, and age of each layer decreases as you move upwards (I.e. a layer in a sequence cannot be younger t...
The globe can experience periods of warming, such as we are experiencing now in the Quaternary period, or it can experience cooling periods leading to ice ages, such as at the Ordovician-Silurian boundary...
Igneous body A intrudes concordantly into the country rock and has baked and chilled margins on both sides of the igneous contact. This show's that is a structure known as a sill.The Olivine forms a band ...
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