Table 4 Slope, intercept and R2-value of the average septal slope factor of 23 species corresponding to their geological age (average value of beginning and end of the corresponding stage after the ICS from 2020, Cohen et al., 2013). For the raw data see Additional file 1
Species | Septal slope factor | Intercept | Age (Ma, midpoint) | R2 of average septal slope factor |
|---|---|---|---|---|
Desmoceras sp. | 0.0078 | − 0.0345 | 105.5 | 0.9719 |
Cleoniceras sp. | 0.0028 | − 0.0237 | 105.5 | 0.8817 |
Gaudryceras sp. | 0.0124 | − 0.0445 | 105.5 | 0.9814 |
Argonauticeras besairei | 0.0107 | − 0.0706 | 105.5 | 0.9759 |
Eogaudryceras umbilicostriatus | 0.004 | 0.0128 | 106.75 | 0.682 |
Divisosphinctes besairei | 0.0037 | − 0.0191 | 154.3 | 0.7048 |
Macroceph. compressus | 0.0041 | − 0.027 | 168.8 | 0.9832 |
Ludwigia bradfordensis | 0.0024 | 0.005 | 172.2 | 0.8381 |
Staufenia opalinoides | 0.0004 | 0.0689 | 172.2 | 0.0837 |
Leioceras sp. | 0.001 | 0.0451 | 176.5 | 0.4042 |
Dactylioceras commune | 0.0027 | − 0.0397 | 178.4 | 0.47 |
Lytoceras fimbriatum | 0.0067 | − 0.0528 | 187.7 | 0.9204 |
Asteroceras sp. | 0.0019 | 0.0019 | 195.05 | 0.8359 |
Arietites sp. | 0.0012 | 0.0973 | 195.05 | 0.7984 |
Fuciniceras cf. isseli | 0.0064 | − 0.0103 | 195.05 | 0.5752 |
Schlotheimia sp. | 0.0036 | − 0.0065 | 196.1 | 0.8074 |
Psiloceras planorbis | 0.0047 | − 0.0064 | 200.3 | 0.9054 |
Psiloceras naumanni | 0.0034 | 0.0499 | 200.3 | 0.8506 |
Arcestes sp. | 0.0048 | − 0.0639 | 222.8 | 0.5523 |
Halorites sp. | 0.0098 | − 0.0519 | 222.8 | 0.9499 |
Cladiscites sp. | 0.0147 | − 0.1953 | 222.8 | 0.935 |
Discophyllites ebneri | 0.0077 | − 0.0311 | 222.8 | 0.9389 |
Megaphyllites sp. | 0.0054 | 0.0647 | 222.8 | 0.8436 |
Monophyllites sp. | 0.0067 | − 0.0206 | 222.8 | 0.9488 |
Rhacophyll. neojurensis | 0.0075 | − 0.0433 | 222.8 | 0.9889 |