Davies, Neil S., McMahon, William J. and Berry, Christopher M. Earth's earliest forest: fossilized trees and vegetation-induced sedimentary structures from the Middle Devonian (Eifelian) Hangman Sandstone Formation, Somerset and Devon, SW England (англ.). — doi:10.1144/jgs2023-204. Архивировано 9 марта 2024 года.
Davies, Neil S., McMahon, William J. and Berry, Christopher M. Earth's earliest forest: fossilized trees and vegetation-induced sedimentary structures from the Middle Devonian (Eifelian) Hangman Sandstone Formation, Somerset and Devon, SW England (англ.). — doi:10.1144/jgs2023-204. Архивировано 9 марта 2024 года.