Calner, Mikael (2005). "Silurian carbonate platforms and extinction events—ecosystem changes exemplified from Gotland, Sweden". Facies. 51 (1–4): 584–591. doi:10.1007/s10347-005-0050-0.
Calner, M. (1999). "Stratigraphy, facies development, and depositional dynamics of the Late Wenlock Fröjel Formation, Gotland, Sweden". GFF. 121 (1): 13–24. doi:10.1080/11035899901211013.
Samtleben, C.; Munnecke, A.; Bickert, T. (2000). "Development of facies and C/O-isotopes in transects through the Ludlow of Gotland: Evidence for global and local influences on a shallow-marine environment". Facies. 43 (1): 1–38. doi:10.1007/BF02536983.
Detailed geological map differentiating members is available on second page of:
"The Silurian Mulde Event and a scenario for secundo–secundo events". Transactions of the Royal Society of Edinburgh: Earth Sciences. 93 (2): 135–154. 2002. doi:10.1017/S0263593302000093.