05.07.2009
Earliest geological time, from about 4,500 million years ago to 544 million years ago
Weight in pounds of a gallon of drilling fluid, which can be twice the weight of water
Pressure measured with respect to atmospheric pressure. (2) Measurement of pressure as measured on a pressure gauge with the addition of atmospheric pressure, which is 14.7 psi at sea level
Rocks from the Pliocene era that were formed between 5 and 1.5 million years ago
5 million to 1.8 million years ago. Is the uppermost subdivision of the long Tertiary period which began 64 million years ago; it represents the final stages of a global cooling trend that led up to the Quaternary ice ages. >
1.8 million – 11,000 years ago. As a descriptive term applied to rocks or faults, it marks the period of rock formation or the time of most recent fault slip
325 to 286 million years ago
Low concentration of one particular compound in another, usually in air or water
A measure of energy equivalent to a thousand trillion joules, or 1,000,000,000,000,000 joules, or roughly 30 million kilowatt-hours. Usually used to express energy consumption by large customers such as cities or major industries, or cumulative output from commercial energy production facilities