Lignite samples from Nagaur district, Rajasthan, have been collected for petrographic and organic geochemical analyses following the pillar sampling method. The reflectance of Eu-Ulminite-B ranges from 0.20 to 0.49 with a mean of 0.33%R-o, putting them as Low-Rank B coal. Hydrogen index values imply type-III kerogen, while the values of T-max (402 to 411 degrees C) indicate that these coals are thermally immature. Gas chromatography data reveal the presence of n-alkanes from C-14 to C-33 with a predominance of odd n-alkanes over the even homologues. Pristane vs. phytane ratio indicates anoxic conditions during the deposition of the organic matter. Saturated fractions of studied lignites suggest a contribution from both conifers and angiosperms as source vegetation.