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That means that tens of millions of years of geologic time lapsed between those two rock layers forming, and there is no sedimentary rock, no rock record, to record the details of what happened during that geologic time.The contact between the Cambrain rock (over 488 million years old) and the Devonian rock (less than 416 million years old) is a type of unconformity, which you will read more about below.Geologic time covers the whole sweep of earth's history, from how and when the earth first formed, to everything that has happened on, in, and to the planet since then, right up to now.

The first incorrect interpretation is that it states that only slow changes occur on earth, the second misinterpretation is that it states that catalclysmic events cannot have happened in the past.The units commonly used for geologic age are mega-annum (Ma) for millions of years, giga-annum (Ga) for billions of years, and kiloannum (ka) ka for thousands of years.Because these units are used according to the rules of the metric system, the M in Ma and the G in Ga must be capitalized, and the k in ka must not be capitalized.In the two centuries after Steno developed the first set of principles for determining relative geologic age, other geologists contributed major ideas that have allowed scientists to grapple with, measure, and come to terms with geologic time.James Hutton of Scotland, the same man who developed the modern concept of the rock cycle as a reflection of the endlessly dynamic and constantly changing earth, advanced the theory of unconformities.

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Absolute geologic age refers to how long ago a geologic event occurred or a rock formed, in numeric terms, such as 65.5 million years ago.

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