Table 1

Mean primary stomatal density (SD), index (SI), and ratio (SR) data in Jameson Land (per depth, 90 to 15 m) and in Scania (per bed or locality number, 1 to 20).

Bed (m)Mean SD ± SE (mm−2)Mean SI ± SESD obs.*S.I obs.Fossil species used for SR analysisSI ± SESR
87.563.2  ±  2.95.9  ±  0.379(8)79(8)Baeira boeggildiana6.4  ±  0.62.04
G. obovatus4.7  ±  0.3
8578.2  ±  5.26.8  ±  0.77(1)6(1)G. obovatus6.8  ±  0.71.65
69.563.6  ±  3.810.3  ±  0.97(1)7(1)
6989.6  ±  13.89.1  ±  0.918(3)18(3)G. acosmica8.5  ±  0.61.33
5968.8  ±  4.611(1)n/a
5441.1  ±  3.67.7  ±  0.911(1)11(1)
5046.1  ±  2.66.2  ±  0.447(3)47(3)Stenopteris3.3  ±  0.33.43
dinosaurensis
4691.1  ±  5.37(1)n/a
4238.8  ±  3.211(1)n/a
3221.8  ± 2.13.8  ±  0.49(1)9(1)B. spectabilis3.8  ±  0.42.97
2513.2  ±  1.13.3  ±  0.315(1)15(1)B. spectabilis3.3  ±  0.33.45
22.525.3  ±  2.35.8  ±  0.516(1)16(1)B. spectabilis5.8  ±  0.51.95
2042.4  ±  3.39.2  ±  0.77(1)7(1)
2028.2  ±  2.25.5  ±  0.824(2)24(2)
2039.7  ±  2.45.3  ±  0.727(2)27(2)B. spectabilis6.7  ±  0.81.69
1550.5  ±  9.64.9  ±  0.86(1)6(1)
159.4  ±  2.48.0  ±  0.372(5)72(5)Ctenis nilssonii6.5  ±  0.41.55
239.9  ±  1.77.0  ±  0.379(5)79(5)C. minuta, C. nilssonii5.8  ±  0.61.75
483.1  ±  3.49.2  ±  0.3109(8)109(8)B. paucipartiata8.9  ±  1.11.27
553.6  ±  5.98.9  ±  0.915(5)15(5)
661.9  ±  2.99.8  ±  0.4108(6)108(6)B. minuta8.4  ±  0.71.34
772.8  ±  2.310.7  ±  0.395(3)95(3)
865.7  ±  1.87.9  ±  0.2291(6)250(6)Baeira sp.4.9  ±  0.32.31
9107.9  ±  4.69.9  ±  1.19(1)3(1)
1147.7  ±  3.488.1  ±  0.635(2)35(2)
1228.5  ±  2.943.8  ±  0.359(2)59(2)B. spectabilis2.9  ±  0.23.89
1419.1  ±  2.03.9  ±  0.412(1)12(1)B. longifolia3.4  ±  0.33.30
1592.5  ±  7.110.1  ±  1.115(2)15(2)Nilssonia polymorpha9.0  ±  0.91.13
2073.2  ±  2.410.1  ±  0.4156(6)156(6)
  • * Total number of primary SD observations per bed or locality with number of species investigated in brackets.

  • Total number of primary SI observations per bed or locality with number of species investigated in parentheses.

  • Mean primary SI data from the subset of Ginkgoalean and Cycadalean species used to calculate stomatal ratios (SR) (21), from which paleoatmospheric CO2 estimates were made (Fig. 2).