This law was independently discovered by William Smith (1769-1839), a British engineer, while working on excavations for canals in England (Winchester, 2002 p.

relative age and relative dating-53

Brongniart was the first to use fossils to date rock strata., which states that geologic events are caused by natural processes, many of which are operating in our own time.

Put another way, the natural laws that we know about in the present have been constant over the geologic past.

Steno formalized the laws of superposition, original horizontality, original continuity and inclusions in his publication entitled states that any inclusion is older than the rock that contains it.

Steno's idea that fossils are older than the rock in which they are found hints at this principle, but Hutton is most often given credit for this principle.states that fossil organisms succeed one another in a definite, irreversible, and determinable order.

Not only did the rock layers indicate changing environments they also revealed that different life forms have existed in different times.

History as a subject stay intriguing as ever; everyone wants to know what happened in the past, how it happened and what was the sequence of the things that occurred.Relative dating uses the principles or laws of stratigraphy to order sequences of rock strata.Relative dating not only determines which layers are older or younger, but also gives insight into the paleoenvironments that formed the particular sequence of rock.Stratigraphy is a branch of geology that studies rock strata with an emphasis on distribution, deposition, age and evidence of past life.Nicolas Steno, William Smith, Georges Cuvier, Alexandre Brongniart, and James Hutton developed the basic rules for the science of stratigraphy.The unconformity consists of many vertical tilted layers of grey shale overlaid by many layers of horizontal red sandstone.