"The insurgent can plunge into the abyss, and the one who plunged into the abyss can rise again." (Howard Phillips Lovecraft. Call of Cthulhu)

" In the depths of the abyss" shale rock era Wenlock, in the south of the county of Herefordshire (United Kingdom) over and over again "dive" tools paleontologists, hoping to find a house for a long time dead and the ancient creatures that "dreams" and waits. [1]

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1) https://en.wikisource.org/wiki/Weird_Tales/Volume_11/Issue_2/The_Call_of_Cthulhu#Part2
2) https://www.ammonit.ru/geochrono/592.htm
3) Mark D. Sutton, Derek E.G. Briggs, David J. Siveter, and Derek J. Siveter, "Visualization and reconstruction of three-dimensional fossils from the Silurian Herefordshire lagerstätte", Palaeontologia Electronica, 4.1 (2001)
4) Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
5) Jeppsson, L.; Calner, M. (2007). "The Silurian Mulde Event and a scenario for secundo—secundo events". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 93 (02): 135–154.
6) https://wikichi.ru/wiki/Wenlock_Group
7) https://royalsocietypublishing.org/doi/full/10.1098/rspb.2018.2792#RSPB20182792F3
8) https://fb.ru/post/history/2019/4/11/85383
9) https://hightech.fm/2019/04/10/sollasina-cthulhu
10) https://maxpark.com/user/4297839381/content/6712320
11) Reich, M., and R. Haude. "Ophiocistioidea (fossil Echinodermata): an overview." Echinoderms: München. Taylor & Francis, London (2004): 489-494.
12) https://onlinelibrary.wiley.com/doi/full/10.1111/pala.12392
13) https://en.wikipedia.org/wiki/Madreporite
14) https://ru.wikipedia.org/wiki/_
15) https://ru.wikipedia.org/wiki/_