Question

The lower rocks in the Muav limestone are 505 million years old. The upper rocks in the Redwall limestone are 340 million years old. What could explain the gap?

Answer 1

Unconformity

Explanation:

The gap between the lower and upper limestone layer can be explained by the occurrence of an unconformity.

An unconformity is a break in stratigraphic record usually marked a prolong period of non-deposition or erosion.

A major break of several millions of years is called a hiatus. A minor break is a diastem.

• During a period of non-deposition, no materials are brought into the basin.
• This can last for several years until deposition resumes again.
• Such a prolonged period of non-deposition causes a break in stratigraphic record.
• At other times, stratigraphic records can be lost to erosion.
• Erosion entails the washing away of the earth.
• This will ultimately cause the loss of records between two strata till deposition resumes.
• In most strata, periods of non-deposition and erosion usually takes place hand in hand.

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