| 1952. | Obolus (Westonia) blackwelderi Walcott Shikama, T. 1952 p. 80, pl. 2, fig. 16 |
| 1943. | Obolus (Westonia) blackwelderi Walcott Shikama, T. 1943 p. 145, pl. 2, fig. 16 |
| 1935. | Obolus (Westonia) cf. blackwelderi Walcott Kobayashi, T. 1935c p. 62, pl. 2, fig. 1 |
| Condition: | Present |
| Taxonomy: | Brachiopoda: |
| Geologic Time: | Paleozoic: |
| Kobayashi, T., 1935c: The Cambro-Ordovician formations and faunas of south Chosen. Palaeontology. Part 3. Cambrian faunas of south Chosen with a special study of the Cambrian trilobite genera and families. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 4, pt. 2, pp. 49–344, pls. 1–24. (Reference No. 0089) |
 |
| Shikama, T., 1943: A handbook of illustrated fossils from Japanese and their adjacent territories., pp. 1–282, pls. 1–46. Nippon Koubutu Syumi-no-kai, Kyoto. (in Japanese) (Reference No. 0616) |
| Shikama, T., 1952: A handbook of illustrated fossils from Japanese and their adjacent territories., pp. 1–376, pls. 1–57. Nippon Koubutu Syumi-no-kai, Kyoto. (in Japanese) (Reference No. 0617) |
| Ichikawa, T., 1988, no. 15, p. 148. |
| Ichikawa, T., 1988, no. 15, p. 139. |
| Ichikawa, T. and Hayami, I., 1978, no. 2, p. 93. |
