* Draw a rectangle on the Google Maps: First click on the dark blue button in the left bottom side of the Google Maps; and then use the mouse to draw a rectangle on the map.
* Give latitudes/longitudes: Type the maximum/minimum of the latitudes and longitudes of the bounding box in the text fields under the Google Maps, and click the button “Locate”, and then a bounding box will be drawn on the Google Maps.
* Input a place name: First type a place name (e.g., Colorado) into the text field at the right hand side under the Google Maps and click the button “Find it”. The system will connect to a Gazetteer to find a bounding box for you. In many cases, the system will return you a list of place names to let you choose. For example, the system may return you three places with the same name “Colorado”.
To use a name of geologic time, first click on the radio button “geologic time” to show a pull down list of all geologic ages. Then choose the geologic age you are interested.
To use explicit time, click on the radio button “geologic time” to show a pull down list of all geologic ages and select “Explicit Time Period”, then type in two numbers.