Table 1 Geochemical data from core Nördlingen 1973.

Average reproducibility for δ15N and δ13Corg are 0.4‰ (1 SD) and 0.1‰, respectively. Average relative errors (1 SD/mean) are 6.5% for TN and 4.4% for TOC. Notes highlight enrichment in organic carbon. n.d., not determined.

Depth (m)Notesδ15N (‰)δ13Corg (‰)TN (wt %)TOC (wt %)
Claystone member (centimeter-scale laminated mud, dark gray)
21.557.47−23.230.040.88
27.555.86−24.410.071.01
28.555.21−27.230.101.68
29.555.65−26.490.071.13
32.957.31−28.250.090.95
35.955.92−28.030.090.87
37.95Coal seam6.31−28.610.5923.46
38.957.23−24.180.174.37
43.586.62−24.610.080.99
49.16.64−26.370.121.87
Marl member (calcareous pale gray mudstone, massive to centimeter-scale bedding)
52.18.63−25.090.163.36
55.17.39−25.450.142.56
58.17.84−25.180.080.77
59.18.09−25.420.060.82
63.19.35−27.960.121.21
65.19.10−27.620.162.51
788.43−23.880.243.87
85.79.63−27.140.142.43
88.78.11−27.100.110.95
95.57.99−26.410.101.54
98.59.20−26.100.122.32
105.510.65−26.170.162.39
106.510.02−29.330.172.96
107.59.35−26.380.162.46
109.59.75−27.180.163.02
Laminite member (millimeter-scale plane laminated mudstone, carbonaceous to bituminous)
111.59.24−27.460.172.32
113.59.96−25.570.132.59
118.59.29−27.960.143.14
121.510.68−27.140.143.00
125.57.91−26.810.225.88
127.5Bituminous13.33−29.190.4820.44
134.511.65−23.530.368.32
140.510.70−29.290.348.50
146.510.20−27.420.245.42
152.511.23−20.860.296.00
154.5Bituminous10.80−11.960.4415.56
158.510.57−22.120.235.05
162.510.85−21.140.213.43
166.510.31−21.700.182.70
170.511.58−19.640.255.33
171.511.95−19.100.388.65
173.5Bituminous11.25nd0.3131.82
174.5Bituminous11.08nd0.2814.84
176.511.94nd0.265.96
177.5Bituminous13.12−16.620.4419.30
178.511.86−21.230.244.51
182.511.10−21.620.305.37
183.512.42−22.070.275.21
185.5Bituminous12.78−21.260.5514.96
186.5Bituminous12.72−30.840.377.57
188.5Bituminous13.52−21.990.439.39
191.5Bituminous11.42−21.480.5310.50
192.5Bituminous12.85−22.900.4313.90
195.5Bituminous12.20−19.650.3813.98
198.513.53−23.660.415.28
202.512.34−27.380.656.62
204.5Bituminous12.46−24.650.7812.58
206.512.73−23.910.324.21
209.513.66−24.030.304.14
211.514.48−24.160.223.05
212.514.38−24.200.589.36
214.513.13−22.350.333.84
215.512.63−22.570.302.95
218.513.05−22.720.495.39
226.510.91−25.470.826.64
228.5Bituminous13.73−25.760.6111.98
230.5Bituminous15.24−26.840.6113.50
232.514.19−24.360.334.85
233.514.46−24.320.344.71
234.516.09−25.090.356.87
236.513.67−34.000.303.14
237.514.56−24.310.254.85
239.5Bituminous14.39−24.940.4411.00
241.5Bituminous17.47−23.030.5913.98
245.5Bituminous13.60−27.990.4312.66
248.5Bituminous11.60−26.440.4313.99
252.5Bituminous10.95−26.090.1910.68
254.54.29−26.730.123.85
Basal member (sandstone with interlaminated carbonaceous mudstone)
258.53.82−26.710.113.72
260.54.73−35.970.134.45
261.56.64−27.030.105.20