[Rockhounds] The T-Rex of Prehistoric Earthworms?

[Paul]

Broughton, P.L. 2017: Enigmatic origin of massive
Late Cretaceous-to-Neogene coprolite-like deposits
in North America: a novel palaeobiological alternative to
inorganic morphogenesis. Lethaia, Vol. 50, 194–216.
http://onlinelibrary.wiley.com/doi/10.1111/let.12186/epdf
http://onlinelibrary.wiley.com/doi/10.1111/let.12186/abstract
http://onlinelibrary.wiley.com/doi/10.1111/let.12186/full

A related paper is:

Yancey, T.E., Mustoe, G.E., Leopold, E.B. and Heizler,
M.T., 2013. Mudflow disturbance in latest Miocene
forests in Lewis County, Washington. Palaios,
Vol. 28(6), 343-358.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.957.6112&rep=rep1&type=pdf
https://www.researchgate.net/profile/George_Mustoe/publication/266138598_Mudflow_disturbance_in_latest_Miocene_forests_in_Lewis_County_Washington/links/542608920cf238c6ea7785e0.pdf

Yours,

Paul H.