Crude oils and source rocks from the northern and offshore Niger Delta basin. Nigeria. have been characterized by gas chromatography-mass spectrometry in terms of their origin and thermal maturity based on the distribution of chrysene and its derivatives. The crude oils and source rocks were characterized by the dominance of chrysene over benzo[a]anthracene. https://trendingcustomes.shop/product-category/custom-shape-led-night-light/