B. G. Van-aarssen, R. Alexander, and R. I. Kagi, Higher plant biomarkers reflect palaeovegetation changes during Jurassic times, Geochimica et Cosmochimica Acta, vol.64, issue.8, pp.1417-1424, 2000.
DOI : 10.1016/S0016-7037(99)00432-9

H. Ageta, K. Shiojima, and Y. Arai, Acid-induced rearrangement of triterpenoid hydrocarbons belonging to the hopane and migrated hopane series., CHEMICAL & PHARMACEUTICAL BULLETIN, vol.35, issue.7, pp.2705-2716, 1987.
DOI : 10.1248/cpb.35.2705

P. Albrecht and G. Ourisson, Triterpene Alcohol Isolation from Oil Shale, Science, vol.163, issue.3872, pp.1192-1193, 1969.
DOI : 10.1126/science.163.3872.1192

T. A. Bryce, G. Eglinton, R. J. Hamilton, M. Martin-smith, and G. Subramanian, Triterpenoids from New Zealand plants-II. The triterpene methyl ethers of Cortaderia toetoe Zotov, Phytochemistry, vol.6, issue.5, pp.727-733, 1967.
DOI : 10.1016/S0031-9422(00)86013-6

T. A. Bryce, M. Martin-smith, G. Osske, K. Schreiber, and G. Subramanian, Sterols and triterpenoids???XI, Tetrahedron, vol.23, issue.3, pp.1283-1296, 1967.
DOI : 10.1016/0040-4020(67)85080-4

A. Chatterjee, S. Mukhopadhyay, and K. Chattopadhyay, Lewis acid catalysed rearrangement of triterpenoids, Tetrahedron, vol.32, issue.24, pp.3051-3053, 1976.
DOI : 10.1016/0040-4020(76)80165-2

R. M. Coates, On the friedelane-oleanane rearrange ment, Tetrahedron Letters, vol.42, pp.4143-4146, 1967.

J. L. Courtney, R. M. Gascoigne, and A. Z. Et-szumer, Triterpenoids of the friedelane series. Part III. The course of friedelane-oleanane rearrangement, J ournal of the Chemical Society, pp.881-886, 1958.

P. A. Cranwell, Organic geochemistry of lacustrine sediments: triterpenoids of higher plant origin reflecting post-glacial vegetational succession Lakes sediments and environmental history, pp.69-92, 1984.

M. C. Das and S. B. Mahato, Triterpenoids, Phytochemistry, vol.22, issue.5, pp.1071-1095, 1983.
DOI : 10.1016/0031-9422(83)80198-8

S. S. Deshmane and S. Dev, Higher isoprenoids???II, Tetrahedron, vol.27, issue.6, pp.1109-1118, 1971.
DOI : 10.1016/S0040-4020(01)90858-0

C. Djerassi, H. Budzikiewicz, and J. M. Wilson, Mass spectrometry in structural and stereochemical problems unsaturated pentacyclic triterpenoids, Tetrahedron Letters, vol.3, issue.7, pp.263-270, 1962.
DOI : 10.1016/S0040-4039(00)70864-1

S. Garcia, H. Heinzen, C. Hubbuch, R. Martinez, X. De-vries et al., Triterpene methyl ethers from palmae epicuticular waxes, Phytochemistry, vol.39, issue.6, pp.1381-1382, 1995.
DOI : 10.1016/0031-9422(95)00173-5

S. H. Goh, F. L. Lai, and P. T. Gee, Wax esters and triterpene methyl ethers from the exocarp of Elaeis guineensis, Phytochemistry, vol.27, issue.3, pp.877-880, 1988.
DOI : 10.1016/0031-9422(88)84111-6

J. Happi, Evidences isotopiques et géochimiques de l'avancée de la forêt sur la savane au Cameroun, Dynamique à long terme des écosystèmes forestiers intertropicaux. UNESCO and IRD publication, pp.169-174, 2000.

V. Hauke, R. Graff, P. Wehrung, J. M. Trendel, P. Albrecht et al., Novel triterpene-derived hydrocarbons of the arborane/fernane series in sediments: Part II, Geochimica et Cosmochimica Acta, vol.56, issue.9, pp.3595-3602, 1992.
DOI : 10.1016/0016-7037(92)90405-8

H. L. Ten-haven, T. M. Peakman, and J. Rullkötter, Early diagenetic transformation of higher-plant triterpenoids in deep-sea sediments from Baffin Bay, Geochimica et Cosmochimica Acta, vol.56, issue.5, 1992.
DOI : 10.1016/0016-7037(92)90326-E

J. Jacob, Enregistrement des variations paléoenvironnementales depuis 20000 ans dans le Nord Est du Brésil (Lac Caçó) par les triterpènes et autres marqueurs organiques, p.296, 2003.

J. Jacob, J. R. Disnar, M. Boussafir, M. Ledru, A. Sifeddine et al., Onocerane attests to dry climatic events during the Quaternary in the tropics, Organic Geochemistry, vol.35, issue.3, pp.289-297, 2004.
DOI : 10.1016/j.orggeochem.2003.11.005

R. Jaffé and K. B. Hausmann, Origin and early diagenesis of arborinone/isoarborinol in sediments of a highly productive freshwater lake, Organic Geochemistry, vol.22, issue.1, pp.231-235, 1995.
DOI : 10.1016/0146-6380(95)90020-9

S. D. Killops, J. I. Raine, A. D. Woolhouse, and R. J. Weston, Chemostratigraphic evidence of higher-plant evolution in the Taranaki Basin, New Zealand, Organic Geochemistry, vol.23, issue.5, pp.429-445, 1995.
DOI : 10.1016/0146-6380(95)00019-B

M. P. Ledru, R. C. Cordeiro, J. M. Dominguez, L. Martin, P. Mourguiart et al., Abstract, Quaternary Research, vol.36, issue.44, pp.47-56, 2001.
DOI : 10.1006/qres.2000.2187

M. P. Ledru, P. Mourguiart, G. Ceccantini, B. Turcq, and A. Sifeddine, Tropical climates in the game of two hemispheres revealed by abrupt climatic change, Geology, vol.30, issue.3, pp.275-278, 2002.
DOI : 10.1130/0091-7613(2002)030<0275:TCITGO>2.0.CO;2

G. A. Logan and G. Eglinton, Biogeochemistry of the Miocene lacustrine deposit, at Clarkia, northern Idaho, U.S.A., Organic Geochemistry, vol.21, issue.8-9, pp.857-870, 1994.
DOI : 10.1016/0146-6380(94)90045-0

S. B. Mahato, S. K. Sarkar, and S. G. Poddar, Triterpenoid saponins, Phytochemistry, vol.27, issue.10, pp.3037-3067, 1988.
DOI : 10.1016/0031-9422(88)80001-3

S. B. Mahato and S. Sen, Advances in triterpenoid research, 1990???1994, Phytochemistry, vol.44, issue.7, pp.1185-1236, 1997.
DOI : 10.1016/S0031-9422(96)00639-5

M. Martin-smith, G. Subramanian, and H. E. Connor, Surface wax components of five species of Cortaderia (gramineae)???A chemotaxonomic comparison, Phytochemistry, vol.6, issue.4, p.559, 1967.
DOI : 10.1016/S0031-9422(00)82918-0

K. Nishimoto, M. Ito, S. Natori, and T. Ohmoto, The structures of arundoin, cylindrin and fernenol, Tetrahedron, vol.24, issue.2, pp.735-752, 1968.
DOI : 10.1016/0040-4020(68)88023-8

T. Ohmoto, M. Ikuse, and S. Natori, Triterpenoids of the gramineae, Phytochemistry, vol.9, issue.10, p.559, 1970.
DOI : 10.1016/S0031-9422(00)85379-0

D. R. Oros and B. Simoneit, Identification and emission factors of molecular tracers in organic aerosols from biomass burning Part 1. Temperate climate conifers, Applied Geochemistry, vol.16, issue.13, pp.1513-1544, 2001.
DOI : 10.1016/S0883-2927(01)00021-X

G. Ourisson and M. Rohmer, Prokaryotic Polyterpenes: Phylogenetic Precursors of Sterols, Current Topics in Membrane Transport, vol.17, pp.153-182, 1982.
DOI : 10.1016/S0070-2161(08)60310-X

S. C. Pakrashi and T. B. Samanta, Acid induced epimerisation and rearrangements of Arborinol, the novel triterpene from Glycosmis arborea, Tetrahedron Letters, vol.38, pp.3679-3684, 1967.

P. Pant and R. P. Rastogi, The triterpenoids, Phytochemistry, vol.18, issue.7, pp.1095-1108, 1979.
DOI : 10.1016/0031-9422(79)80115-6

K. E. Peters and J. M. Moldowan, The biomarker guide, 1993.

M. Ries-kautt, Etude des lipides dans divers types de sols. Aspects Moléculaires, p.152, 1986.

D. D. Rowan and G. B. Russell, 3??-methoxyhop-22(29)-ene from Chionochloa cheesemanii, Phytochemistry, vol.31, issue.2, pp.702-703, 1992.
DOI : 10.1016/0031-9422(92)90066-Y

J. W. Rowe and C. L. Bower, Triterpenes of pine barks: naturally occurring derivatives of serratenediol, Tetrahedron Letters, vol.6, issue.32, pp.2745-2750, 1965.
DOI : 10.1016/S0040-4039(01)83904-6

J. Rullkötter, T. M. Peakma-n, and H. L. Et-ten-haven, Early diagenesis of terrigenous triterpenoids and its implications for petroleum geochemistry, Organic Geochemistry, vol.21, issue.3-4, pp.215-233, 1994.
DOI : 10.1016/0146-6380(94)90186-4

G. B. Russell, H. E. Connor, and A. W. Purdie, Triterpene methyl ethers of Chionochloa (Gramineae), Phytochemistry, vol.15, issue.12, pp.1933-1935, 1976.
DOI : 10.1016/S0031-9422(00)88849-4

M. L. Salgado-labouriau, Late quaternary palaeoclimate in the savannas of South America, Journal of Quaternary Science, vol.109, issue.5, pp.371-379, 1997.
DOI : 10.1002/(SICI)1099-1417(199709/10)12:5<371::AID-JQS320>3.0.CO;2-3

U. Samaraweera, S. Subramaniam, M. Sultanbawa, and S. , 3,5,7,3???,5???-Pentahydroxyflavan and 3??-methoxyfriedelan from Humboldtia laurifolia, Phytochemistry, vol.22, issue.2, pp.565-567, 1983.
DOI : 10.1016/0031-9422(83)83047-7

K. Shiojima, Y. Arai, K. Masuda, Y. Takase, T. Ageta et al., Mass Spectra of Pentacyclic Triterpenoids., CHEMICAL & PHARMACEUTICAL BULLETIN, vol.40, issue.7, pp.1683-1690, 1992.
DOI : 10.1248/cpb.40.1683

A. Sifeddine, A. L. Albuquerque, M. Ledru, B. Turcq, B. Knoppers et al., A 21???000 cal years paleoclimatic record from Ca???? Lake, northern Brazil: evidence from sedimentary and pollen analyses, Palaeogeography, Palaeoclimatology, Palaeoecology, vol.189, issue.1-2, pp.25-34, 2003.
DOI : 10.1016/S0031-0182(02)00591-6

S. Uyeo, J. Okada, S. Matsunaga, and J. W. Rowe, The structure and the stereochemistry of abieslactone, Tetrahedron, vol.24, issue.7, pp.2859-2880, 1968.
DOI : 10.1016/S0040-4020(01)98695-8

M. Vliex, H. W. Hagemann, and W. Püttmann, Aromatized arborane/fernane hydrocarbons as molecular indicators of floral changes in Upper Carboniferous/Lower Permian strata of the Saar-Nahe Basin, southwestern Germany, Geochimica et Cosmochimica Acta, vol.58, issue.21, pp.4689-4702, 1994.
DOI : 10.1016/0016-7037(94)90201-1