Lipids and fatty acids were extracted from eight specimens of fossil teeth that were reliably estimated to be 100,000 to 230,000,000 years old. The kinds and relative amounts of individual fatty acids present in the extract were estimated by gas-liquid chromatography. These ancient teeth were found to be similar to modern animal teeth in lipid and fatty acid content. It is noteworthy that unsaturated fatty acids (ie, oleic and linoleic acids) survived storage in teeth for millions of years.
Shackleford, J.M., and Wyckoff, R.W.G.: Collagen in Fossil Teeth and Bones, J Ultrastruct Res11:173-180, 1964.
5.
Wyckoff, R.W.G. , and Doberenz, A.R.: The Electron Microscopy of Rancho La Brea Bone, Proc Nat Acad Sci USA53: 230-233, 1965.
6.
Foucart, M.F. ; Bricteux-Gregoire , S.; Jeuniaux, C.H.; and Florkin, M.: Fossil Proteins of Graptolites, Life Sci4:467-471, 1965.
7.
Ho, Tong-Yun : The Amino Acid Composition of Bone and Tooth Proteins in Late Pleistocene Mammals, Proc Nat Acad Sci USA54:26-31, 1966.
8.
Ho, Tong-Yun : The Isolation and Amino Acid Composition of the Bone Collagen in Pleistocene Mammals, Comp Biochem Physiol18:353, 1967.
9.
Nagy, B., and Bitz, M.C.: Long Chain Fatty Acids from the Orguel Meteorite, Arch Biochem Biophys101:240-248, 1963.
10.
Belsky, T.; Johns, R.B.; Mccarthy, E.D.; Burlingame, A.L.; Richter, W.; and Calvin, M.: Evidence of Life Processes in a Sediment Two and a Half Billion Years Old , Nature206:446-447, 1965.
11.
Kvenvolden, K.A.: Molecular Distributions of Normal Fatty Acids and Paraffins in Some Lower Cretacious Sediments, Nature209:573-577, 1960.
12.
Das, S.K. , and Harris, R.S.: Fatty Acids in the Tooth Lipids of 16 Animal Species, J Dent Res49:119-125, 1970.