Table 1. 

Sample details and apatite fission-track age data for samples from two Inner Moray Firth wells

Sample number GC237-Depth (m)Stratigraphic details*ρD† (106 tracks cm2)ρs† (106 tracks cm2)ρi† (106 tracks cm2)ZetaPooled/central fission-track age‡ (Ma)P(S2) (%) (no. of grains)Mean track length§ (μm)
Well 12/23-1
27869–905Middle–Lower Oxfordian1.340 (2105)2.074 (1181)1.500 (854)360.3 ± 6.8330.8 ± 29.3<1 (20)11.77 ± 0.20 (101)
(157–156 Ma)
281225–1356Upper Permian–Triassic1.3393.3162.613360.3 ± 6.8301.9 ± 17.4<111.17 ± 0.17
(256–208 Ma)(2105)(1847)(1455)(20)(103)
291676–1813Lower Permian1.3372.6852.149360.3 ± 6.8268.1 ± 22.6<110.76 ± 0.20
(290–256 Ma)(2105)(1784)(1428)(20)(121)
302565–2566Devonian1.3361.0593.454360.3 ± 6.876.1 ± 10.8<110.42 ± 0.24
(408–363 Ma)(2105)(753)(2456)(20)(105)
Well 12/24-2
552676–2685Lower Volgian1.6681.1442.757360.3 ± 6.8117.2 ± 21.9<18.84 ± 0.25
(152–150 Ma)(2608)(742)(1789)(20)(110)
563596–3673Triassic1.6630.5632.074360.3 ± 6.830.6 ± 10.7<19.67 ± 0.53
(208–245 Ma)(2608)(430)(1583)(20)(27)
  • All analytical details are as described by Green (1986), with the exception that some thermal neutron irradiations show a significant flux gradient, in which case the appropriate value of ρD was determined by linear interpolation through the stack of grain mounts.

  • * All numerical values for stratigraphic ages assigned following Harland et al. (1989).

  • Numbers in parentheses show the number of tracks counted in determining all track densities.

  • Central age (Galbraith & Laslett 1993), used for samples containing a significant spread in single grain ages (P(S2) <5%).

  • § Numbers in parentheses show the number of track lengths measured.