What is Portland limestone?
Q: What is Portland limestone?
A: Portland limestone is a type of limestone that was deposited during the latest stage of the Upper Jurassic period.
Q: Where was Portland limestone first found?
A: Portland limestone was first found on the Isle of Portland, Dorset.
Q: Is Portland limestone limited to a small area?
A: No, it occurs over a wider area, including France.
Q: What are the colors of the beds of limestone in Portland limestone?
A: The beds of limestone in Portland limestone are white-gray.
Q: What is the composition of the layers in Portland limestone?
A: The layers in Portland limestone are beds of white-grey limestone separated by beds of chert.
Q: When was Portland limestone deposited?
A: Portland limestone was deposited during the latest stage of the Upper Jurassic period.
Q: How is Portland limestone different from other types of limestone?
A: Portland limestone is unique in its deposition period and location, and its distinctive layers of white-grey limestone separated by beds of chert.
