1. Department of Natural and Social Sciences, Bowling Green State University, One University Drive, Huron, Ohio 44839, USA
2. Department of Geology and Geological Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph Street, Rapid City, South Dakota 57701, USA
3. Departamento de Geología, Escuela Politécnica Nacional, Ladron de Guevera E11-253, Quito 170517, Ecuador
4. Department of Geology, Bowling Green State University, 190 Overman Hall, Ohio 43403, USA