Some of these, like Sony’s Walkman, were the first of their kind. It’s those devices we’re recognizing in this list of the 50 most influential gadgets of all time. Each owes its influence to one model that changed the course of technology for good. The TV that serves as a portal to binge-watching and -gaming. The camera that goes with you on every vacation. This set of Fundamental Geologic Principles, still in use today, is the basis for the construction of the relative geologic time scale.Think of the gear you can’t live without: The smartphone you constantly check. ![]() Geologists deduced the various principles used to determine relative dating hundreds of years ago. Relative dating does not tell when a particular event occurred or how long it lasted-relative dating simply puts events in order of occurrence with respect to one another. Geologists determine the sequence of events from their position in the rock record with older events/rocks usually occurring in the lowest layers and later events higher in the rock sequence. For a layer of rock to be considered a formation, it must spread across a relatively large area that can be depicted on a geologic map. ![]() Rock formations can record these events: an ocean will result in marine limestone, a volcanic eruption in basaltic lava or a layer of ash, and a sand dune in sandstone. Relative age dating involves placing geologic events such as an ocean’s existence, a volcanic eruption, or the duration of a dune field in a sequential order.
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