Geological Timescale

This Android App shows the geological time scale of the history of the earth. The time scale shows the units Eonothem, Erathem, Period, Epoch and Stage. It shows the begin of every period and if it is a GSSP. The time scale can be scrolled up and down if it does not fit on the screen. The view can be changed to fit the height of the display. Additionally, there is a true to scale option which sets the height of all periods according to its duration. You can select a period by touching it.