Carbonate Nodule from the Cretaceous Wayan Formation

Images collected by Jeffry Ross and Greg Ludvigson at the Kansas Geological Survey, University of Kansas.

Paired reflected light (left) and cathodoluminescence (right) images of carbonate nodule from the Cretaceous Wayan Formation of eastern Idaho.

From Ross et al. (2017) in SCIENCE CHINA—Earth Sciences 60:44-57 (doi: 10.1007/s11430-016-0087-5).

Operating conditions for the CL image were: 10 kV; 0.6 mA; 53 mTorr Helium atmosphere. Integration time was about 1 second.