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CC BY-SA 1.0], via Wikimedia Commons' src=" alt="" width="474" height="251" srcset=" sizes="(max-width: 474px) 85vw, 474px"/An atom that has different number of neutrons but the same number of protons.

The principle of inclusions states that any rock fragments that are included in rock must be older than the rock in which they are included.

Nicolaus Steno (1638-1686) introduced basic principles of becoming known as “the Father of English Geology.” Nineteenth-century scientists developed a relative time scale using Steno’s principles, with names derived from the characteristics of the rocks in those areas.

The figure of this geologic time scale shows the names of the units and subunits.

(The near-vertical stripes are blasting drill holes.

The image is about 7 m across.) [SE photo] An unconformity represents an interruption in the process of deposition of sedimentary rocks.

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