Fig. 1From: Interaction between dendritic radix structures of pelmatozoan echinoderms on a hardground in the middle Silurian (Wenlock) of southeastern Indiana, USALocation of the study area, the New Point Stone quarry east of Napoleon, Ripley County, Southeastern Indiana, USA. The specimen was collected from a laterally continuous hardground in the northern part of the quarry. Figure from Thomka and Brett (2015a, fig. 1)Back to article page