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Figure 2. Correlation of the English Cenomanian using carbon isotope stratigraphy. Black lines are primary d¹³C data; thick lines are smoothed trends calculated as three-point moving averages. Key biostratigraphic datums by circled numerals. Note the expanded vertical scale used for the Trunch and Speeton successions. Lithological log for Culver after Jarvis et al. (2001). Biostratigraphic data sources: Culver; Jarvis et al. (2001), Dover, Jenkyns et al. (1994), Gale (1995, 1996); Trunch, Wood et al. (1994); Speeton, Mitchell (1996), Mitchell et al. (1996). Isotope data sources: Culver, Paul et al. (1994) Jarvis et al. (2001), Dover, Jenkyns et al. (1994), Lamolda et al. (1994), Mitchell (1996); Trunch, (this study); Speeton, Mitchell et al. (1996). Reported d¹³C values of Paul et al. (1994) and Mitchell et al. (1996) increased by +.18 ‰ to connect data offset with data of Jenkyns et al. (1994); all other data as reported. Abbreviations: Alb, Albian; Ce, Cenomanian; MJ, Middle Jurassic; Sd, Stoliczkaia dispar; Mm, Mantelliceras mantelli; Mantelliceras dixoni; Ci, Cunningtoniceras inerma; Ar, Aranthoceras rhotomaganese; Aj, A. jukes-brownei; C, Calycoceras guerangeri; Mg, Metoicoceras geslinianum; N, Niocardioceras juddii; Wd, Watinoceras devonense; Fc, Fagesia catinus; Mn, Mammites nodosoides; UG, Upper Greensand; GM, Glauconitic Marl; PM, Plenus Marl; BC, Ballard Cliff; OM 1-3, Orbirhynchia mantelliana bands 1-3; P/B break, planktonic/benthonic break; ACBE, Albian/Cenomanian Boundary Event; LCEI-III, Lower Cenomanian Events I-III; MCEI, II, Mid-Cenomanian Events I, II; CTBE, Cenomanian/Turonian Boundary Event.