Following up on Josh's answer, it looks like Utica is an older, deeper play than Marcellus, and even that Marcellus is entirely contained within the footprint of the Utica. See the map on the EIA website: http://www.eia.doe. read more
The Utica Shale might host the world's largest single accumulation of natural gas confined to a single rock unit. read more
The Utica shale layer is about 443 million years old, it is present in parts of Kentucky, Maryland, New York, Ohio, Pennsylvania, Tennessee, West Virginia and Virginia. read more
The Marcellus Shale is the largest natural gas field in the United States and one of the largest in the world. read more