Universidad Nacional Autónoma de México

• Grado Obtenido: Doctor en Ciencias (Oceanografía Geológica)
  Institución: UNAM, 12-2000
  Tema: Estudio paleoceanográfico y sedimentológico holcénico de la Bahía de la Paz, Golfo de California

Licenciatura

Paleobiología. Facultad de Ciencias, UNAM. Facultad de Ciencias (Nivel Licenciatura).

Ciencias de la Tierra. Facutad de Ciencias, UNAM.

Taller sobre Principios de Paleoceanografía y Paleoclimatología. Facultad de Ciencias (Nivel Licenciatura)

Microscopia Electrónica de Barrido y Microanálisis por rayos X aplicados a Geociencias. Instituto Mexicano del Petróleo. No. de veces impartido: 4 (1996-1997).

Paleontología. Facultad de Ciencias, UNAM. Nivel: Licenciatura. No. de veces que se impartió: 8 semestres (1988-1992)

Posgrado

Principios de Paleoceanografía y Paleoclimatología. Posgrado en Ciencias del Mar y Limnología, UNAM). Semestre 2013-1

Detección y Atribución del Cambio Climático, Rconstrucciones Paleoclimáticas. (24 horas) Colegio de la Frontera Sur- Unidad Chetumal.  6 al 8 de julio de 2011.

Métodos de Paleogeografía, Paleoclimas y Paleoambientes. Posgrado de Ciencias del Mar y Limnología. Semestre 2012-1

Paleoceanografía (Posgrado en Ciencias del Mar y Limnología).

• Zhao, J., Xiao, L., Gulick, S.P.S., Morgan, J.V., Kring, D., Urrutia-Fucugauchi, J., Schmieder, M., de Graaff, S. J., Wittmann, A., Ross, C.H., Claeys, P., Pickersgill, A., Kaskes, P., Goderis, S., Rasmussen, C., Vajda, V., Ferriére, L., Feignon, J.G., Chenot, E., Pérez-Cruz, L., Sato, H., Yamaguchi, K., IODP-ICDP Expedition 364 scientist. 2020. Geochemistry, geochronology and petrogenesis of Maya Block granitoids and dikes from the Chicxulub Impact Crater, Gulf of México: Implications for the assembly of Pangea. Gondwana Research, 82: 128 – 150. DOI: 10.1016/j.gr.2019.12.003.
  
  
• Choumiline, K., Pérez-Cruz, L., Gray, B. A., Bates, M. B., Lyons, W. T. 2019. Scenarios of Deoxygenation of the Eastern Tropical North Pacific During the Past Millennium as a Window Into the Future of Oxygen Minimum Zones. Marine Biogeochemistry, 237 (7): 1 – 23. Impact Factor: 2.892. DOI: 10.3389/feat.2019.00237.
  
  
• Gulick, S.P.S., Bralower, T. J., Ormö, J., Hall, B., Grice, K., Schaefer, B., Lyons, S., Freeman, K. H., Morgan, J. V., Artemieva, N., Kashes, P., de Graaff S. J., Whalen, M. T., Collins, G. S., Tikoo, S. M., Verhagen, C., Christeson, L., Claeys, P., Coolen, M. J. L., Goderis, S., Goto, K., Grieve R. A. F., McCall, N., Osinski, G. R., Rae, A. S. P., Riller, U., Smit, J., Vajda, V., Wittmann, A. and the Expedition 364 Scientists. 2019. The first day of the Cenozoic. Proceedings of the National Academy of Sciences, 116 (39): 1-10. DOI: 10.1073/pnas.1909479116. ISSN: 0027-8424.
  
  
• Rasmussen, C., Stockli, D.F., Ross, C. H., Pickersgill, A., Gulick, S. P., Schmieder, M., Christeson, G. L., Wittmann, A., Kring, D. A., Morgan, J. V., and the IODP-ICDP Expedition 364 Science Party. 2019. U-Pb memory behavior in Chicxulub´s peak ring – Applying U-Pb depth profiling to shocked zircón. Chemical Geology, 525: 356 – 367. DOI: 10.1016/j.chemgeo.2019.07.029. ISNN: 0009-2541.
  
  
• Smith, V., Warny, S., Jarzen, D. M., Demchuk, T., Vajda, V. and The Expedition 364 Science Party. 2019. Palaeocene-Eocene miospores from the Chixculub impact cráter, Mexico. Part 1: spores and gymnosperm pollen. Palynology, DOI: 10.1080/01916122.2019.1630860. ISSN 0191-6122.
  
  
• Urrutia-Fucugauchi, J., Pérez-Cruz, L., Morgan, J., Gulick, S., Wittmann, A., Lofi, J. and IODP-ICDP Expedition 364 Science Party. 2019. Peering inside the peak ring of the Chixculub Impact Crater_its nature and formation mechanism. Geology Today, 35 (2): 68-72. DOI: 10.1111/gto.12261. ISSN 0266-6979.
  
  
• Kring, D. A., Claeys, P., Gulick, S.P.S., Morgan, J.V., Collins, G.S., Bralower, T. and Expedition 364 Science Party (Chenot, E., Christeson, G., Cockell, C., Coolen, M.L., Ferriére, L., Gebhardt, C., Goto, K., Green, S., Jones, H., Kring, D., Lofi, J., Lowery, C., Ocampo-Torres, R., Pérez-Cruz, L., Pickersgill, A., Poelchau, M., Rae, A., Rasmussen, C., Rebolledo-Vieyra, M., Riller, U., Sato, H., Smit, J., Tikoo, S.M., Urrutia-Fucugauchi, J., Whalen, M., Wittmann, A., Xiao, L., Yamaguchi, K., Zylberman, W). 2017. Chicxulub and the exploration of large peak-ring impact craters through scientific drilling. GSA Today, 27(10): 4-8. DOI:10.1130/GSATG352A.1.
  
  
• Lowery, C. M., Morgan, J. V., Gulick, S. P. S., Bralower, T. J., Christeson, G. L. and Expedition 364 Scientists. 2019. Ocean Drilling Perspectives on Meteorite Impacts. Oceanography, 32 (1): 120-134. DOI: 10.5670/oceanog.2019.133. ISSN 1042-8275.
  
  
• Rae, A. S. P., Collins, G. S., Poelchau, M., Riller, U., Davison, T. M., Grieve, R. A. F., Osinski, G. R., Morgan, J. V. and IODP-ICDP Expedition 364 Scientists. 2019. Stress-Strain evolution during peak-ring formation: A case study of the Chicxulub impact structure. Journal of Geophysical Research: Planets, 124 (2): 396-417. DOI: 10.1029/2018JE005821. ISSN 2169-9097.
  
  
• Riller, U., Poelchau, M.H., Rae, A.S.P., Schulte, F.M., Collins, G.S., Melosh, H.J., Grieve, R.A.F., Morgan, J.V., Gulick, S.P.S., Lofi, J., Diaw, A., McCall, N., Kring, D.A., IODP-ICDP Expedition 364 Science Party (Morgan, J.V., Gulick, S.P.S., Green, S.L., Lofi, J., Chenot, E., Christeson, G.L., Claey, P., Cockell, C.S., Coolen, M.J.L., Ferrière, L., Gebhardt, C., Goto, K., Jones, H., Kring, D.A., Xiao, L., Lowery, C.M., Ocampo-Torres, R., Perez-Cruz, L., Pickersgill, A.E., Rae, A.S.P., Rasmussen, C., Rebolledo-Vieyra, M., Sato, H., Smit, J., Tikoo, S.M., Tomioka, N., Whalen, M.T., Wittmann, A., Yamaguchi, K., Urrutia-Fucugauchi, J., Bralower, T.J.). 2018. Rock fluidization during peak-ring formation of large impact structures. Nature, 562 (7728): 511-518. DOI: 10.1038/s41586-018-0607-z. ISSN: 0028-0836
  
  
• Lowery, C., Bralower, T., Owens, J., Rodríguez-Tovar, F., Jones, H., Smit, J., Whale, M. T., Claeys, P., Farley K., Gulick, S., Morgan, J.V., Green, S., Chenot, E., Christeson, G.L., Cockell, C.S., Coolen, M., Ferriére, L., Geghardt, C., Goto, K., Green, S., Jones, H., Kring, D, Lofi, J., Ocampo-Torres, R., Pérez-Cruz, L., Pickersgill, A., Poelchau, M., Rae, A., Rasmussen, C., Rebolledo-Vieyra, M., Riller, U., Sato, H., Smit, J., Tikoo, S.M., Tomioka, N., Urrutia-Fucugauchi, J., Wittmann, A., Xiao, L., Yamaguchi, K., Zylberman, W. 2018. Rapid recovery of life at ground zero of the end-Cretaceous mass extiction. Nature, 558: 288–291. Impact Factor: 41.577. DOI: 10.1038/s41586-018-0163-6. ISSN 0028-0836.
  
  
• Christeson, G.L., Gulick, S.P.S., Morgan, J.V., Gebhardt, C., Kring, D.A., Le Ver, E., Lofi, J., Nixon, C., Poelchau, M., Rae, A.S.P., Rebolledo-Vieyra, M., Riller, U., Schmitt, D.R., Wittmann, A., Bralower, T.J., Chenot, E., Claeys, P., Cockell, C.S., Coolen, M.J.L., Ferrière, L., Green, S., Goto, K., Jones, H., Lowery, C.M., Mellett, C., Ocampo-Torres, R., Pérez-Cruz, L.., Pickersgil, A.E., Rasmussen, C., Sato, H., Smit, J., Tikoo, S.M., Tomioka, N., Urrutia-Fucugauchi, J., Whalen, M.T., Xiao, L., Yamaguchi, K.E. 2018. Extraordinary rocks from the peak ring of the Chicxulub impact crater: P-wave velocity, density, and porosity measurements from IODP/ICDP Expedition 364. Earth and Planetary Science Letters, 495: 1-11. DOI: 10.1016/j.epsl.2018.05.013. ISSN: 0012-821X.
  
  
• Lofi, J., Smith, D., Delahunty, C., Le Ber, E., Brun, L., Henry, G., Paris, J., Tikoo, S., Zylberman, W., Pezard, P.A., Célérier, B., Schmitt, D.R., Nixon, C., IODP-ICDP Expedition 364 Science Party (Gulick, S.P.S., Morgan, J.V., Chenot, E., Christeson, G.L., Claeys, P., Cockell, C.S., Coolen, M.J.L., Ferrière, L., Gebhardt, C., Goto, K., Green, S., Jones, H., Kring, D.A., Lowery, C.M., Mellett, C., Ocampo-Torres, R., Pérez-Cruz, L., Pickersgill, A.E., Poelchau, M., Rae, A.S.P., Rasmussen, C., Rebolledo-Vieyra, M., Riller, U., Sato, H., Smit, J., Tomioka, N., Urrutia-Fucugauchi, J., Whalen, M.T., Wittmann, A., Xiao, L., Yamaguchi, K.E., Bralower, T.J.) 2018. Drilling-induced and logging-related features illustrated from IODP-ICDP Expedition 364 downhole logs and borehole imaging tools. Scientific Drilling, 24: 1-13. DOI: 10.5194/sd-24-1-2018. ISSN: 0934-4365.
  
  
• Pérez-Cruz, L., Urrutia-Fucugauchi, J. 2018. Magnetic mineral diagenesis in anoxic laminated sediments from the southern Gulf of California. Studia Geophysica et Geodaetica, 62 (1):115-138. Impact Factor: 9.70. DOI: 10.1007/s11200-016-0443-2. ISSN: 1573-1626.
  
  
• Pérez-Cruz, L., Urrutia-Fucugauchi, J. 2017. Magnetic mineral diagenesis in anoxic laminated sediments from the southern Gulf of California. Studia Geophysica et Geodaetica, 1-24. doi:10.1007/s11200-016-0443-2.
  
  
• Artemieva, N., Morgan, J., Expedition 364 Science Party (Gulick, S., Chenot, E., Christeson, G., Claeys, P., Cockell, C., Coolen, M.L., Ferriere, L., Gebhardt, C., Goto, K., Green, S., Jones, H., Kring, D., Lofi, J., Lowery, C., Ocampo-Torres, R., Perez-Cruz, L., Pickersgill, A., Poelchau, M., Rae, A., Rasmussen, C., Rebolledo, M., Riller, U., Sato, H., Smit, J., Tikoo, S.M., Urrutia-Fucugauchi, J., Whalen, M., Wittmann, A., Xiao, L., Yamaguchi, K., Zylberman, W., Collins, G., Bralower, TJ.) 2017. Quantifying the release of climate-active gases by large meteorite impacts with a case study of Chicxulub. Geophysical Research Letters, v. 44, 10,180-10.188 https:doi.org/10.1002/2017GL074879.
  
  
• Joanna V. Morgan, J.V., Gulick, S.P.S., Bralower, T., Chenot, E., Christeson, G., Claeys, P., Cockell, C., Collins, G.S, Coolen, M.J.L., Ferrière, L., Gebhardt, C., Goto, K., Jones,H., Kring, D.A., Le Ber, E., Lofi, J., Long, X., Lowery, C., Mellett, C., Ocampo-Torres, R., Osinski, G.R., Perez-Cruz, L., Pickersgill, A., Poelchau, M., Rae,A., Rasmussen, C., Rebolledo-Vieyra, M., Riller, U., Sato, H., Schmitt, D.R., Smit, J., Tikoo, S., Tomioka, N., Urrutia-Fucugauchi, J., Whalen, M., Wittmann, A., Yamaguchi, K. E., Zylberman, W. 2016. The formation of peak rings in large impact craters. Science 354 (6314), 878-882. [doi: 10.1126/science.aah6561] (November 17, 2016). Impact Factor 34.661. ISSN: 0036-8075
  
  
• Barbara, L., Schmidt, S., Urrutia-Fucugauchi, J., Pérez-Cruz, L. 2016. Fuerte River floods, an overlooked source of terrigenous sediments to the Gulf of California. Continental Shelf Research 128, 1-9. Impact Factor: 2.011. ISSN: 0278-4343
  
  
• Goff, J. A., Gulick, S., Pérez-Cruz, L., Stewart H. A., Davis, M., Duncan D., Saustrup S., Sanford J., Urrutia-Fucugauchi, J., 2016. Solution pans and linear sand drifts on the bare-rock limestone shelf of the Campeche Bank, Yucatán Peninsula, Mexico. Continetal Shelf Research 117, 57-66. Febrero 2016. http://dx.doi.org/10.1016.j.csr.2016.02.005. Impact Factor: 2.011. ISSN: 0278-4343
  
  
• Martínez-López, A., Álvarez-Gómez, I. G., Pérez-Cruz, L., Verdugo-Díaz, G., Villegas-Aguilera, M.M., 2016. Production, exportation and preservation of silicoflagellates in Alfonso Basin, Gulf of California. Journal of Sea Research 109:52-62 http://dx.doi.org.10.1016/j.seares.2016.01.005. Enero 2016. Impact Factor 2.148. ISSN: 1385-1101
  
  
• Delgadillo-Peralta, M., Urrutia-Fucugauchi, J., Pérez-Cruz, L., Velasco-Villarreal M., 2015. Rock magnetic and AMS fabrics characterization of suevitic breccias from the Cretaceous-Paleogene Chicxulub impact crater. Revista Mexicana de Ciencias Geológicas, 32 (1): 145-155.
  
  
• Sánchez-Beristain, F., Simon, K., Pérez-Cruz, L., García-Barrera, P., López-Esquivel Kranksith, L., Urrutia-Fucugauchi, J., Duda, J. P., 2015. The use of LAICP-MS in a pilot study for determining the concentration of selected trace elements in rudist shells. Boletín Geológico y Minero 126 (1): 159-168. ISSN: 0366-0176
  
  
• Urrutia-Fucugauchi, J., Pérez Cruz, L., Flores Gutiérrez, D., 2014. Meteorite paleomagnetism – From magnetic domains to planetary fields and core dynamos. Geofisica Internacional 53 (3): 343-363. DOI: 10.1016/S0016-7169(14)71510-7.
  
  
• Whalen, M., Gulick, S.P., Pearson, Z., Norris, R.D., Pérez-Cruz, L., Urrutia-Fucugauchi, J., 2014. Annealing the Chicxulub impact: Paleogene Yucatan carbonate slope development in the Chicxulub impact basin, Mexico. Society for Sedimentary Geology Sp. Publ., 105: 282-304. DOI: 10.2110/sepmsp.105.04
  
  
• Urrutia-Fucugauchi, J., Trigo-Huesca, A., Tellez, E., Pérez-Cruz, L., Méndez-Rivero, F., Valsequillo Project Team, 2014. Volcano-sedimentary stratigraphy in the Valsequillo basin, central Mexico inferred from electrical resistivity soundings. Geofisica Internacional 53(1): 87-94. DOI: 10.1016/S0016-7169(14)71492-8
  
  
• Roy P.D., Quiroz-Jiménez J.D., Chávez-Lara C.M., Sánchez-Zavala J.L., Pérez-Cruz, L., Muthu-Sankar, G., 2014. Humid Pleistocene−Holocene transition and early Holocene in sub-tropical northern Mexico and possible Gulf of California forcing. Boreas, 43, 577-587. DOI:10.1111/bor.12062. ISSN 0300-9483.
  
  
• Urrutia-Fucugauchi, J., Pérez-Cruz, L., Campos, S.E., Escobar, J.E., Velasco-Villarreal, M., 2014. Magnetic susceptibility logging of Chicxulub proximal impact breccias in the Santa Elena borehole – Breccia characterization and ejecta blanket. Studia Geophysica et Geodaetica 58 (1): 100-120. DOI: 10.1007/s11200-013-0803-0
  
  
• Roy, P.D., Rivero-Navarrette, A., López-Balbiaux, N., Pérez-Cruz, L., Metcalfe, S. E., Sankar, G.M., Sánchez-Zavala, J.L., 2013. A record of Holocene summer-season palaeohydrological changes from the southern margin of Chihuahua Desert (Mexico) and possible forcings. Holocene, 23(8): 1105-1114. DOI: 10.1177/0959683613483619.
  
  
• Pérez-Cruz, L., 2013. Hydrological changes and paleoproductivity in the Gulf of California during middle and late Holocene and their relationship with ITCZ and North American Monsoon variability. Quaternary Research, 79(2):138-151. DOI: 10.1016/ j.yqres.2012.11.007. ISSN: 00335894.
  
  
• Urrutia-Fucugauchi, J., Pérez-Cruz, L., Camargo-Zanoguera, A., 2013. Oil exploration in the Southern Gulf of Mexico and the Chicxulub impact. Geology Today, 29(5): 182-189.
  
  
• Roy, P.D., Quiroz-Jiménez, J.D., Pérez-Cruz, L., Lozano-García, S., Metcalfe, S.E., Lozano-Santacruz R., López-Balbiaux, N., Sánchez-Zavala, J.L., Romero, F.M., 2013. Late Quaternary paleohydrological conditions in the drylands of northern Mexico: a summer precipitation proxy record of the last 80 cal ka BP. Quaternary Science Reviews 78: 342-354. DOI: 10.1016/j.quascirev.2012.11.020. ISSN: 02773791.
  
  
• Álvarez, M.C., Pérez-Cruz, L., Hernández-Contreras, R., 2012. Coccolithophore and silicoflagellate records in Middle-Late Holocene Sediments from La Paz Basin (Gulf of California): Paleoclimatic implications. Stratigraphy, 9(2):169–181. ISSN 1547-139X.
  
  
• Roy, P.D, Jonathan, M.P., Pérez-Cruz, L., Sánchez-Córdoba, M.M., Quiroz-Jiménez, J.D., Romero F.M., 2012. A millennial-scale Late Pleistocene-Holocene palaeoclimatic registred from western Chihuahua Desert, Mexico. Boreas, 41(4): 707-718. DOI: 10.1111/j.1502-3885.2012.00266.x. ISSN: 03009483.
  
  
• Urrutia-Fucugauchi, J., Delgadillo-Peralta, M., Pérez-Cruz, L., Velasco-Villarreal, M., 2012. Heating-induced changes in the anisotropy of magnetic susceptibility of impact breccias, Chicxulub Crater (Mexico). Studia Geophysica et Geodaetica, 56(3): 769-767. DOI: 10.1007/s11200-010-0292-3. ISSN: 0039-3169.
  
  
• Velasco-Villareal, M., Urrutia-Fucugauchi, J., Rebolledo-Vieyra, M., Pérez-Cruz, L., 2011. Paleomagnetism of impact breccias from the Chicxulub crater – Implications for ejecta emplacement and hydrothermal processes. Physics of the Earth and Planetary Interiors, 186: 154-171. DOI: 10.1016/j.pepi.2011.04.003. ISSN: 00319201.
  
  
• Urrutia Fucugauchi, J., Camargo-Zanoguera, A., Pérez-Cruz, L., Pérez-Cruz, G., 2011. The Chicxulub multi-ring impact crater, Yucatan carbonate platform, Gulf of Mexico. Geofísica Internacional, 50(1): 99-127. ISSN: 00167169.
  
  
• Urrutia-Fucugauchi, J., Pérez-Cruz, L., 2011 Buried impact basins, the evolution of planetary surfaces and the Chicxulub multi-ring crater. Geology Today, 27(6):220-225. DOI: 10.1111/j.1365-2451.2011.00814.x.
  
  
• Pérez-Cruz, L., Urrutia-Fucugauchi, J., 2010. Characterization of distal turbidites in marine sedimentary sequence – use of magnetic mineral data and factor analysis of microfossils assemblages. Studia Geophysica et Geodaetica, 54: 595-606. DOI: 10.1007/s11200-010-0036-4. ISSN: 00393169.
  
  
• Pérez-Cruz, L., Urrutia-Fucugauchi, J., 2010. Holocene laminated sediments from the southern Gulf of California – Geochemical, Mineral Magnetic and Microfossil Study. Journal of Quaternary Science, 25(6): 989-1000. DOI: 10.1002/jqs.1386. ISSN 0267-8179.
  
  
• Pérez-Cruz, L., Urrutia-Fucugauchi, J. 2009. Magnetic mineral study of Holocene marine sediments from the Alfonso Basin, Gulf of California - implications for depositional environment and sediment sources. Geofísica Internacional 48(3): 305-318. ISSN: 00167169.
  
  
• Urrutia-Fucugauchi J., Pérez-Cruz, L., 2009. Multiring-forming large bolide impacts and evolution of planetary surfaces. International Geology Review 51:1079-1102. DOI: 10.1080/ 00206810902867161. ISSN: 00206814.
  
  
• Urrutia-Fucugauchi, J., Pérez-Cruz, L., 2008. Post-impact carbonate deposition in the Chicxulub impact crater region, Yucatan platform, Mexico. Current Science, 95(2): 248-252. ISSN: 00113891.
  
  
• Fuentes-Farias, A.L., Urrutia-Fucugauchi, J., Gutiérrez-Ospina, G., Pérez-Cruz, L., Garduño-Monroy, V.H., 2008. Magnetic Features of Marine Black Turtle Natal Beaches and Implications for Nest Selection. Geofísica Internacional, 47(4): 311-318. ISSN: 00167169.
  
  
• Urrutia-Fucugauchi, J., Chavez-Aguirre, J.M., Pérez-Cruz, L., De la Rosa, J.L., 2008. Impact Ejecta and Carbonate Sequence in the Eastern Sector of Chicxulub Crater. Comptes Rendus Geosciences, 340: 801-810. DOI: 10.1016/j.crte.2008.09.001 ISSN: 16310713.
  
  
• Urrutia-Fucugauchi, J. Pérez-Cruz, L., Morales-Puente, P., Escobar-Sánchez, J.E., 2008. Stratigraphy of the Basal Paleocene Carbonate Sequence and the Impact Breccia–Carbonate Contact in the Chicxulub Crater: Stable Isotope Study of the Santa Elena Borehole Rocks. International Geology Review, 50: 75-83. DOI: 10.2747/0020-6814.50.1.75 ISSN: 00206814.
  
  
• Pérez-Cruz, L., 2006. Climate and ocean variability during middle and late Holocene recorded in laminated sediments from Alfonso Basin, Gulf of California, Mexico. Quaternary Research, 65: 401-410. DOI: 10.1016/j.yqres.2006.02.003 ISSN: 00335894.
  
  
• Vázquez-Gutiérrez, F., Sharma, V. K., Pérez-Cruz, L., 2002 Concentrations of elements and metals in sediments of Southeastern Gulf of Mexico. Environmental Geology, 42: 41-46. DOI: 10.1007/s00254-001-0522-7 ISSN: 09430105.
  
  
• Molina-Cruz, A., Pérez-Cruz, L., Monreal-Gómez, M.A., 2002. Laminated sediments in Bay of La Paz, Gulf of California: a depositional cycle regulated by pluvial flux. Sedimentology, 49(6): 1401-1410. ISSN: 00370746.
  
  
• Pérez-Cruz, L., Machain Castillo, M.L., 1990. Benthic foraminifera of the oxygen minimum zone, continental shelf of the Gulf of Tehuantepec, Mexico. Journal of Foraminiferal Research 20(4): 312-325. ISSN: 00961191.