Representative samples from a wide range of ail shale occurrences in Israel, aging from Campanian to middle Maastrichtian, were analysed for their solid state C-13 NMR pattern and for some additional properties in an attempt to assess their energy potential and to examine if significant differentiations between various basins and strata can be determined. The results demonstrate a great similarity which prevails between all subsurface samples from the different sampled basins and strata; thus, the aliphatic and aromatic carbon ratios determined by NMR does not show significant variations. The average Fischer assay to oil conversion value of all the samples is about 59 %, a value which copes well with the relatively narrow range (0.6-0.7) of the aliphatic carbon fraction. The conversion amount of organic carbon to oil found in the Israeli samples is quite below that of the Green River oil shales but is considerably higher than that of the US Eastern oil shales. Higher trends of the aromaticity in the rocks and the specific gravity of the generated oils are indicated in the Mishash (Campanian) samples when compared to those of the Ghareb (Maastrichtian). One surface sample gave a unique NMR spectrum. It may be due to severe oxidation causing a partial decomposition of the organic material, or due to a different source material input. The NMR spectrum resemble those of oil shales from other basins around the Mediterranean, in Turkey, Jordan, Morocco and Spain.