shell creek shale 예문

• Eicher redefined these beds in 1960 as the Shell Creek Shale, separating them from the Mowry Shale.
• This effectively put the Thermopolis Shale below the Muddy Sandstone Formation . } } In 1998, Porter et al . identified the Shell Creek Shale as the upper member of the Thermopolis Shale, a position with which Lash agreed in 2011.