Cryptospores are generally found in non-marine rocks and decrease in abundance with distance offshore. This suggests that any cryptospores found in the marine environment were transported there by the wind from the land, rather than originating from the marine environment.
^Steemans, P.; Lepot, K.; Marshall, C. P.; Le Hérissé, A.; Javaux, E. J. (2010). "FTIR characterisation of the chemical composition of Silurian miospores (cryptospores and trilete spores) from Gotland, Sweden". Review of Palaeobotany and Palynology162 (4): 577. doi:10.1016/j.revpalbo.2010.07.006.edit