"kerogen." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/kerogen>.
kerogen. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/kerogen
A fossilized mixture of insoluble organic material that, when heated, breaks down into petroleum and natural gas. Kerogen consists of carbon, hydrogen, oxygen, nitrogen, and sulfur and forms from compacted organic material, including algae, pollen, spores and spore coats, and insects. It is usually found in sedimentary rocks, such as shale.