Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U. S. A. Author Burrow, Carole Jan Author Murphy, Michael Author Turner, Susan text PaleoBios 2023 2023-06-06 40 1975 1 32 http://dx.doi.org/10.5070/p940454153 journal article 10.5070/P940454153 0031-0298 10913559 58312615-0833-432E-BF5D-3DFFBF361AAA GOMPHONCHUS MEDIOCOSTATUS VERGOOSSEN, 1999A Type material Holotype NNM 423013 ; paratypes NNM 423014–423023 , NNM 423044 , NNM 423045 ; East Baltic derived erratic limestone boulder 62, Oosterhaule , northern Netherlands , Late Silurian (Přidolí).