<p> Supplementary Data 1 - Faunal List and Relative Abundance of Fossil Taxa from the Kersadiou Formation</p><p>RO PE SF ZO SQ GO TI LA LF Coelenterata 1. Procteria granulifera x x x x x x x x 2. Kerforneidictyum kerfornei r - r r x x r x 3. Aulopora sp. x x x x c c c c 4. Metrionaxon paucitabulatum - - - r - - r - 5. Hadrophyllidae?, morph A - - r x r r x x 6. Hadrophyllidae?, morph B - - - - x r - r 7. Rugosa indet.. trochoid form r - - - x r - r Brachiopoda 8. Lingula sp. r - - r r r x r 9. Indet. Craniid. - - - r - - r r 10. Leptagonia sp. - r - x - x r x 11. Bojodouvillina taeniolata x c c x c c c c 12. Parastrophonella anaglypha r x x r c c c c 13. Ogorella janickae - c c a a a a 14. Holynetes stephaniae x a a r a a a a 15. Arcuaminetes kerfornei a a a a a a a a 16. Dagnachonetes dominicae c c c c r r x r 17. Spinulicosta spinulicosta c c c x x c c c 18. Iridistrophia sp. r x r x r x c x 19. Skenidium sp. r x r - x r x r 20. Prokopia sp. x x x x c x c x 21. Aulacella eifeliensis - - - - x - r 22. Indet. Pentamerid - - - - r r - - 23. Cupularostrum soetenicum - x - - r - - - 24. Atrypa (Planatrypa) collega r r r r r x x x 25. Desquamatia (Synatrypa) sp. 1 r ------x 26. Nucleospira sp. x x r x x x x x 27. Athyrid indet. x x x x x x x x 28. ‘Cyrtina’ sp. x x x x x x c x 29. Spinocyrtia sp. x r x x - - r r 30. ‘Reticularia’ sp. - - - r - - - - 31. Bifida lepida r x c r - - - - Gastropoda 32. Sinuitina morzadeci - - r - r x r r 33. Crenistriella armoricana - - r - x x c r 34. Tropidodiscus sp. ------r - 35. Retispira ? sp. - - r - x x x - 36. Patellilabia ponceti - - - - - r r - 37. Angyomphalus weyanti - - - - r x x - 38. Calvibembexia lethiersi - - - - - r r - 39. Kersadiella babini - - - - - r r - 40. Breizospira crozonensis ------r -</p><p>1 RO PE SF ZO SQ GO TI LA LF 41. Finisterella tibidiensis - - - - r r x - 42. Eoplatyzona ongaroae - - - - r r x - 43. Brokenriveria sp. cf. B. caelata - - - - r r x - 44. Platyceras (Platyceras) sp. - - - - - r - - 45. Naticopsis (Naticopsis) sp. ------r - 46. Murchisonia gourvenneci - - - - x c x r 47. Hormotomina fiacrensis x x x x c c c c 48. Parahormotomina sibertae - - - - r r r - 49. Nodoloxonema plusquelleci - - - - r r r - 50. Palaeozygopleura sp. - x x x c c c x 51. Leptozyga ? sp. - - - - r x r - 52. Subulites (Fusispira ?) sp. - - - - - r r - 53. High-spired subulitid - - - - r r r - 54. Rounded subulitid. - r r - - - r - Bivalve mollusks 55. Praectenodonta attenuata - r - - x x x r 56. Nuculoidea grandaeva r - r r r r x - 57. Nuculopsis ? lisser - - r - r r x r 58. Palaeoneilo emarginata - - - - r x x - 59. Palaeoneilo constricta - r r r x x c x 60. Palaeoneilo triangulata - - - r - r x - 61. Palaeoneilo sp. - - - - - r r - 62. Nuculites subrectangularis - - - r x x x x 63. Nuculites celticus - - - - x x c x 64. Cucullela triquetra x r x r c c c x 65. Cucullella (Ditichia) sp. 1 - - - - r - r - 66. Cucullella (Ditichia) sp. 2 - - - - r - r - 67. cf. Phestia rostellata r - x - x x c x 68. cf. Phestia brevirostris - - - - r r x r 69. Levibuchiola digitata - - - - x r x r 70. Glyptohallicardia ferruginea - - - - r r x - 71. Buchiolinae indet. - - - - x r x r 72. Ontaria subconcentrica - - - - r r x - 73. Cryptodonta indet. ------r - 74. Ptychopteria (Actinopteria) boydi - - - r r r x - 75. Ptychopteria (Actinopteria) sp. - - r - - - - - 76. Leptodesma (Leiopteria) cf. dekayi - - r - r - r - 77. Leptodesma (Leiopteria) sp. ------r - 78. Mytilarca insolita r - - - r r x r 79. Mytilarca sp. - - - - - r - - 80. Parallelodon hamiltoniae - r r r r - x - 81. Parallelodon sp. ------r - 82. Modiomorpha mytiloides - - - x x r c - 83. Modiomorpha sp. ------r - 84. Goniophora sp. - r - - r r x - 85. Cycloconchidae gen. et sp. indet. ------r - 86. Carydium hafferi ------x - 87. Eoschizodus aff. ellipticus - - - - r - r -</p><p>2 RO PE SF ZO SQ GO TI LA LF 88. Eoschizodus ? sp. ------x - 89. Prosocoelus bipleuroides ------r - 90. Cypricardella cf. tenuistriata - - - r x - r - 91. Paracyclas rugosa - - - - r - r - 92. Paracyclas proavia r r - - r r x - 93. Orthonota carinata - - - - r r r r 94. Prothyris cf. planulata ------x - 95. Prothyris nov. sp. ? - - - - - r r - 96. Sanguinolites porteri ------r - 97. Pholadella concentrica. - - - - r - r - Cephalopoda 98. Orthocone nautiloid sp. 1 r r x r c c x c 99. Orthocone nautiloid sp. 2 ------r - 100. Bactrites sp. r x r x c c c c 101. Agoniatites sp. - - - - - r x - Tentaculitida 102. ‘Tentaculites ‘sp. - x c x c c c c Conulariida 103. Conularia sp. - - - - - r - r Hyolithids 104. ‘Hyolithes’ sp. 1 - - - - r x x x 105. ‘Hyolithes’ sp. 2 - - - - r x - r 106. ‘Hyolithes’ sp. 3 - r r r r x x r Cornulitida 107. Cornulites sp. r x - - a a c a Blastoids 108. cf. Cordyloblastus clavatus - - - - - r - - Crinoids 109. Haplocrinites sp. - - - - + - + - 110. Myelodactylus canaliculatus + ------111. Botryocrinus convexus + - - - - - + - 112. Ancyrocrinus armoricanus + + - - - - + - 113. Decadocrinus kersadiouensis - + - - - - + - 114. Facetocrinus quelernensis + - - - - - + - 115. Maretocrinus angustannulus + - - - + + + - 116. Schyschcatocrinus goasquellouensis + + - - + + + - 117. Glyphidocrinus carinatus + - - - + - + - 118. Tjeecrinus sp. - - - - + - - - 119. Paracyclocaudex gluziauensis + + + - + + + - Machaeridians 120. Plumulites s.l. - - - - r - r - Ostracodes 121. Parabolbinella n. sp. A - - - - + + + - 122. Ctenoloculina eurybathrota - + - - + + + - 123. Punctoprimitia simplex - - + - - - + - 124. Samarella ? sp. - - - - + - - - 125. Poloniella claviformis - - - - + - + - 126. Poloniella trisinuata - - + - + - + -</p><p>3 RO PE SF ZO SQ GO TI LA LF 127. Poloniella sp. 1 ------+ - 128. Bythocyproidea cf. sobolevi ------+ - 129. Polyzygia neodevonica - - - - - + + - 130. Polyzygia beckmanni antecedens - - - - + + + - 131. Quasillites cf. lecomptei ------+ - 132. Costatia cf. quasilitiformis ------+ - 133. Ponderodictya punctulifera - + + - + + + - 134. Jenningsina cavernosa ------+ - 135. Jenningsina cf. heddebauti ------+ - 136. Jenningsina sp. ------+ - 137. Bufina? sp. ------+ - 138. Leptoprimitia circumvallata - - + - - - - - 139. Metacopida gen. et sp. indet. ------+ - 140. Cryptophyllus sp. - - - - - + - - Trilobites 141. Phacops sp. - r r - - r r r 142. Heliopyge camfroutensis r - - - - r r x 143. Heliopyge renaudae - - - - r r r r 144. Proetus (Gerastos) aff. tenuimargo - - - - - r r r 145. Otarion sp. - - - - - r - r Phyllocarids 146. Echinocaridiid ? sp. - r r - - - r - Vertebrates 147. Placoderm indet. ------+ - 148. Ptyctodont indet. ------+ - 149. Acanthothoraci indet. ------+ -</p><p>With the exception of crinoids, ostracodes, and vertebrates, symbols used for relative abundance of specimens are: a (= abundant, tens to hundreds of specimens found), c (= commonly found from tens of specimens), x (= present, fewer than twenty specimens), r (= rare, only one or two specimens found). Because crinoids, ostracodes, and vertebrates could not be used for quantitative analysis purposes, their presence in a given section is indicated by +.</p><p>Localites: RO = Roscanvel; PE = Persuel; SF = Saint-Fiacre; ZO = Zorn; SQ = Squiffiec; LE = Lestraouen; PC = Pont- Callec; PO = Porsguen; GO = Goasquellou; TI = Tibidy: LA = Lanvoy; LF = Le Faou</p><p>4</p>