REFERENCES
- Berry, W.B.N. & Murphy, M.A., 1975: Silurian and Devonian graptolites of central Nevada. University of California Publications in Geological Sciences110, 1–109, 15 pls.
- Bjerreskov, M., 1975: Llandoverian and Wenlockian graptolites from Bornholm. Fossils and Strata8, 1–93.
- Bjerreskov, M., 1992: Upper Llandovery and Wenlock Cyrtograptus from the Silurian Peary Land Group. Northern Greenland. Bulletin Grønlands Geologiske Undersø163, 1–31.
- ChurkinJr, M. & Carter, C., 1996: Stratigraphy, structure, and graptolites of an Ordovician and Silurian sequence in the Terra Cotta Mountains, Alaska Range, Alaska. U.S. Geological Survey Professional Paper1555, 74–75.
- Deng, Bao, 1979: On the occurrence of Cyrtograptus (graptolite) from Ziyang, Shaanxi. Acta Palaeontologica Sinica18 (3), 308–310. [in Chinese].
- Fu, Li-Pu, 1983: Silurian stratigraphy in Bajiaokou, Bulletin of the Xi'an Institute of Geology and Mineral Resources. Chinese Academy of Geological Science6, 1–18. [in Chinese].
- Fu, Li-Pu, 1985: The upper Llandovery and Lower Wenlock Cytrograptus of Ziyang County, Shaanxi Province, China. Acta Palaeontologica Sinica24 (3), 322–331. [in Chinese].
- Fu, Li-Pu, 1986: Graptolite zones of upper Ordovician–middle Silurian, Ziyang. Geological Society Special Publication20, 131–134.
- Fu, Li-Pu, 2000: The Most Complete Sequence of Telychian Graptolite Zone in the World. Acta Geologica Sinica (English Edition)74 (2), 126–131.
- Fu, Li-Pu & Song, Li-sheng, 1986: Stratigraphy and paleontology of Silurian in Ziyang region (Transitional belt). Bulletin of the Xi'an Institute of Geology and Mineral Resources, Chinese Academy of Geological Science14, 1–198. [in Chinese with English resume].
- Golikov, A.N., 1969: New Early Wenlockian graptolites of the Family Cyrtograptidae from southwestern Tien Shan. Paleontologicheskii Zhurnal3, 506–516. [in Russian].
- Golikov, A.N., 1974: The early Wenlock graptolite findings in the Malguzar Mountains. Graptolity SSSR. Trudy Inst. Geol. Geofiz. Sib. Otdel. AN SSSR, 95:90–105. (In Russian).
- Huo, Shi-Cheng, 1986: A mathematical study of the Cyrtograptus sakmaricus lineage with discussions of the evolutionary trends in this lineage. In C.P.Hughes & R.B.Rickards (eds.): Palaeoecology and Biostratigraphy of Graptolites. Vol. 20, 197–205. Geological Society Special Publication, London.
- Jackson, D.E. & Etherington, J.R., 1969: New Silurian cyrtograptid graptolites from northwestern Canada and northern Greenland. Journal of Paleontology43 (5), 1114–1121, pls 11–26.
- Koren', T.N., 1968: Novye rannesiluriiskie graptolity yuzhnogo Urala: Akademiya Nauk SSSR. Paleontologicheskii Zhurnal4, 531–533.
- Lenz, A.C., 1978: Llandoverian and Wenlockian Cyrtograptus, and some other Wenlockian graptolites from northern and Arctic Canada. Geobios 11, fasc. 5, 623–653, pls 1–7.
- Lenz, A.C., 1988: Upper Llandovery and Wenlock graptolites from Prairie Creek, southern Mackenzie Mountains, Northwest Territories. Canadian Journal of Earth Sciences25, 1955–1971.
- Lenz, A.C. & Melchin, M.J., 1989: Monograptus spiralis and its phylogenetic relationship to early cyrtograptids. Journal of Paleontology63 (3), 341–348.
- Loydell, D.K., 2012: Graptolite biozone correlation charts. Geological Magazine149 (1), 124–132.
- Melchin, M.J., 1989: Llandovery graptolite biostratigraphy and paleobiogeography, Cape Phillips Formation. Canadian Journal of Earth Science26, 1726–1746.
- Mu, En-Zhi, 1982: Graptolithina. In Institute of Geology and Palaeontology Academy Sinica (ed.): A Hand book of Index Fossils of South China. 41–46, 49, 50, 54–58, 60–62. Sciences Press, Beijing.
- Štorch, P., 2006: Facies development, depositional settings and sequence stratigraphy across the Ordovician–Silurian boundary: a new perspective from Barrandian area of the Czech Republic. Geological Journal41, 163–192.