DeepTime puts geological time at your fingertips. Not only does it have the latest geological time scale, it is fully interactive - tap on any time unit to see more detail about it, including where its GSSP (golden spike) is. It even has the color codes, great for when you need to have the right color for a map or chart. Even more, it is completely searchable by name or age. Come across an unfamiliar time term in an older paper? Search for it, too, and you'll see how it relates to the modern time scale.
What's more is that all the GSSPs (the golden spikes) are shown on a gorgeous geological map of the world (courtesy of macrostrat.org) that shows their context in stunning detail. Tips for using time terms are also included with simple examples. Whether you are a geologist, a student, a science writer, or just a fan of Earth history, DeepTime will become your go-to resource for understanding geological time.
With Family Sharing set up, up to six family members can use this app.