The images are provided by Dr. James E. Conkin and Prof. Barbara M. Conkin, Louisville, Kentucky. The specimens were found by them at the 13 localities shown left.
The images and accompanying information are published: Conkin, J. E. and Conkin, B. M., 1964: Mississippian Foraminifera of the United States Part 1: The Northview Formation of Missouri in Micropaleontology Vol. 10, No. 1 (Jan., 1964), pp. 19-47.
We thank Micropaleontology Press for giving the permission to use the images and accompanying information. Read more in the above mentioned article as a subscriber of the journal Micropaleontology or ask your local library to subsribe to Micropaleontology.