Definition: Argillos are a type of fossilized rock that's colored gray or yellowish brown, often with black veins or fissures. They're not all argillos but can be found in different parts of the world. Definition: "argilloarenaceous" refers to argillos that have been subjected to the process of being heated by high temperature. This means that argillos may be formed from rocks that have been exposed and then heated to temperatures above 10,000 degrees Celsius (21,800 degrees Fahrenheit). The resulting material is a gray or brown color with black or yellow veins. So in summary: argillos are argilaceous rocks that have been subjected to high-temperature heating.
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