The Neogene Record of Northern South American Native Ungulates
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Chronostratigraphy of the Mammal-Bearing Paleocene of South America 51
Thierry SEMPERE biblioteca Y. Joirriiol ofSoiiih Ainorirari Euirli Sciriin~r.Hit. 111. No. 1, pp. 49-70, 1997 Pergamon Q 1‘197 PublisIlcd hy Elscvicr Scicncc Ltd All rights rescrvcd. Printed in Grcnt nrilsin PII: S0895-9811(97)00005-9 0895-9X 11/97 t I7.ol) t o.(x) -. ‘Inshute qfI Human Origins, 1288 9th Street, Berkeley, California 94710, USA ’Orstom, 13 rue Geoffroy l’Angevin, 75004 Paris, France 3Department of Geosciences, The University of Arizona, Tucson, Arizona 85721, USA Absfract - Land mammal faunas of Paleocene age in the southern Andean basin of Bolivia and NW Argentina are calibrated by regional sequence stratigraphy and rnagnetostratigraphy. The local fauna from Tiupampa in Bolivia is -59.0 Ma, and is thus early Late Paleocene in age. Taxa from the lower part of the Lumbrera Formation in NW Argentina (long regarded as Early Eocene) are between -58.0-55.5 Ma, and thus Late Paleocene in age. A reassessment of the ages of local faunas from lhe Rfo Chico Formation in the San Jorge basin, Patagonia, southern Argentina, shows that lhe local fauna from the Banco Negro Infeiior is -60.0 Ma, mak- ing this the most ancient Cenozoic mammal fauna in South,America. Critical reevaluation the ltaboraí fauna and associated or All geology in SE Brazil favors lhe interpretation that it accumulated during a sea-level lowsland between -$8.2-56.5 Ma. known South American Paleocene land inammal faunas are thus between 60.0 and 55.5 Ma (i.e. Late Paleocene) and are here assigned to the Riochican Land Maminal Age, with four subages (from oldest to youngest: Peligrian, Tiupampian, Ilaboraian, Riochican S.S.). -
Evolutionary and Functional Implications of Incisor Enamel Microstructure Diversity in Notoungulata (Placentalia, Mammalia)
Journal of Mammalian Evolution https://doi.org/10.1007/s10914-019-09462-z ORIGINAL PAPER Evolutionary and Functional Implications of Incisor Enamel Microstructure Diversity in Notoungulata (Placentalia, Mammalia) Andréa Filippo1 & Daniela C. Kalthoff2 & Guillaume Billet1 & Helder Gomes Rodrigues1,3,4 # The Author(s) 2019 Abstract Notoungulates are an extinct clade of South American mammals, comprising a large diversity of body sizes and skeletal morphologies, and including taxa with highly specialized dentitions. The evolutionary history of notoungulates is characterized by numerous dental convergences, such as continuous growth of both molars and incisors, which repeatedly occurred in late- diverging families to counter the effects of abrasion. The main goal of this study is to determine if the acquisition of high-crowned incisors in different notoungulate families was accompanied by significant and repeated changes in their enamel microstructure. More generally, it aims at identifying evolutionary patterns of incisor enamel microstructure in notoungulates. Fifty-eight samples of incisors encompassing 21 genera of notoungulates were sectioned to study the enamel microstructure using a scanning electron microscope. We showed that most Eocene taxa were characterized by an incisor schmelzmuster involving only radial enamel. Interestingly, derived schmelzmusters involving the presence of Hunter-Schreger bands (HSB) and of modified radial enamel occurred in all four late-diverging families, mostly in parallel with morphological specializations, such as crown height increase. Despite a high degree of homoplasy, some characters detected at different levels of enamel complexity (e.g., labial versus lingual sides, upper versus lower incisors) might also be useful for phylogenetic reconstructions. Comparisons with perissodactyls showed that notoungulates paralleled equids in some aspects related to abrasion resistance, in having evolved transverse to oblique HSB combined with modified radial enamel and high-crowned incisors. -
Pleistocene Mammals and Paleoecology of the Western Amazon
PLEISTOCENE MAMMALS AND PALEOECOLOGY OF THE WESTERN AMAZON By ALCEU RANCY A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY UNIVERSITY OF FLORIDA 1991 . To Cleusa, Bianca, Tiago, Thomas, and Nono Saul (Pistolin de Oro) . ACKNOWLEDGMENTS This work received strong support from John Eisenberg (chairman) and David Webb, both naturalists, humanists, and educators. Both were of special value, contributing more than the normal duties as members of my committee. Bruce MacFadden provided valuable insights at several periods of uncertainty. Ronald Labisky and Kent Redford also provided support and encouragement. My field work in the western Amazon was supported by several grants from the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) , and the Universidade Federal do Acre (UFAC) , Brazil. I also benefitted from grants awarded to Ken Campbell and Carl Frailey from the National Science Foundation (NSF) I thank Daryl Paul Domning, Jean Bocquentin Villanueva, Jonas Pereira de Souza Filho, Ken Campbell, Jose Carlos Rodrigues dos Santos, David Webb, Jorge Ferigolo, Carl Frailey, Ernesto Lavina, Michael Stokes, Marcondes Costa, and Ricardo Negri for sharing with me fruitful and adventurous field trips along the Amazonian rivers. The CNPq and the Universidade Federal do Acre, supported my visit to the. following institutions (and colleagues) to examine their vertebrate collections: iii . ; ; Universidade do Amazonas, Manaus -
Archive Table 1 – Data for Pre-GABI South American Paleofaunas Analyzed in the Present Study
Archive Table 1 – Data for pre-GABI South American paleofaunas analyzed in the present study. SALMA refers to South American Land Mammal “Age,” an informal system of biochronologic units that allows for intracontinental correlation (see Fig. 1). Fauna SALMA (Age) Pred. Prey Ratio Source(s) Notes Chasicoan both upper and lower Arroyo Chasicó 3 38 0.08 Croft in press (late Miocene) biozones Kay et al., 1997; Meldrum Monkey Beds, La Laventan 2 49 0.04 and Kay, 1997; Croft, in only Monkey Beds level Venta, Colombia (middle Miocene) press Kay et al., 1997; Meldrum Entire fauna, La Laventan entire fauna (i.e., all 6 64 0.09 and Kay, 1997; Croft, in Venta, Colombia (middle Miocene) levels) press Quebrada Honda, Laventan (middle 2 28 0.07 Croft in press Bolivia Miocene) Collón-Curá, Colloncuran 1 37 0.03 Croft in press Argentina (middle Miocene) P. australe Zone, Santacrucian upper biozone of 2 34 0.06 Tauber 1997 Santa Cruz, Argentina (early Miocene) Santa Cruz Fm. P. attenuatum Zone, Santacrucian lower biozone of 1 30 0.03 Tauber 1997 Santa Cruz, Argentina (early Miocene) Santa Cruz Fm. Santacrucian Croft et al., 2004, unpubl. Chucal, Chile 0 17 0.00 (early Miocene) data Scarritt Pocket, Deseadan Chaffee, 1952; Marshall 2 17 0.12 Argentina (late Oligocene) et al., 1986 Shockey 1997a with additions based on Sánchez-Villagra and Kay, 1997; Shockey, Deseadan (late Salla, Bolivia 6 37 0.16 1997b, 2005; Shockey all levels Oligocene) and Anaya, 2004, in press; Reguero and Cerdeño, 2005; Shockey et al., 2005 Flynn et al., 2003b; Croft Tinguirirican Tinguiririca, Chile 0 25 0.00 et al., 2003; Reguero et (early Oligocene) al., 2003 La Gran Hondonada, Mustersan 2 37 0.05 Cladera et al., 2004 Argentina (late Eocene) Gran Barranca, Barrancan subage of Casamayoran 4 42 0.10 Cifelli 1985 Argentina (late Eocene) SALMA Archive Table 2 – Data for Australian paleofaunas analyzed in the present study. -
Teeth Complexity, Hypsodonty and Body Mass in Santacrucian (Early Miocene) Notoungulates (Mammalia) Guillermo H
Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 106, 303–313, 2017 Teeth complexity, hypsodonty and body mass in Santacrucian (Early Miocene) notoungulates (Mammalia) Guillermo H. Cassini1,2,7, Santiago Herna´ndez Del Pino3,7, Nahuel A. Mun˜oz4,7, M. V. Walter G. Acosta5, Mercedes Ferna´ndez2,6,7, M. Susana Bargo4,8 and Sergio F. Vizcaı´no4,7 1 Divisio´n Mastozoologı´a, Museo Argentino de Ciencias Naturales ‘‘Bernardino Rivadavia’’, Ciudad Auto´noma de Buenos Aires, Argentina. Email: [email protected] 2 Departamento de Ciencias Ba´sicas, Universidad Nacional de Luja´n, Luja´n, Buenos Aires, Argentina. Email: [email protected] 3 Paleontologı´a, Instituto de Nivologı´a, Glaciologı´a y Ciencias Ambientales, Centro Cientı´fico Tecnolo´gico – CONICET Mendoza, Mendoza, Argentina. Email: [email protected] 4 Divisio´n Paleontologı´a Vertebrados, Museo de La Plata, Unidades de Investigacio´n Anexo Museo, FCNyM-UNLP, 60 y 122, 1900 La Plata, Argentina. Email: [email protected]; [email protected]; [email protected] 5 Ca´tedra de Semiologı´a, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Calle 60 y 118 s/n, La Plata, Argentina. Email: [email protected] 6 Divisio´n Paleontologı´a de Vertebrados, Museo Argentino de Ciencias Naturales ‘‘Bernardino Rivadavia’’, Ciudad Auto´noma de Buenos Aires, Argentina. 7 CONICET. Consejo Nacional de Investigaciones Cientı´ficas y Te´cnicas. 8 CIC. Comisio´n de Investigaciones Cientı´ficas de la provincia de Buenos Aires. ABSTRACT: Notoungulates, native South American fossil mammals, have been recently objective of several palaeoecological studies. -
Revised Stratigraphy of Neogene Strata in the Cocinetas Basin, La Guajira, Colombia
Swiss J Palaeontol (2015) 134:5–43 DOI 10.1007/s13358-015-0071-4 Revised stratigraphy of Neogene strata in the Cocinetas Basin, La Guajira, Colombia F. Moreno • A. J. W. Hendy • L. Quiroz • N. Hoyos • D. S. Jones • V. Zapata • S. Zapata • G. A. Ballen • E. Cadena • A. L. Ca´rdenas • J. D. Carrillo-Bricen˜o • J. D. Carrillo • D. Delgado-Sierra • J. Escobar • J. I. Martı´nez • C. Martı´nez • C. Montes • J. Moreno • N. Pe´rez • R. Sa´nchez • C. Sua´rez • M. C. Vallejo-Pareja • C. Jaramillo Received: 25 September 2014 / Accepted: 2 February 2015 / Published online: 4 April 2015 Ó Akademie der Naturwissenschaften Schweiz (SCNAT) 2015 Abstract The Cocinetas Basin of Colombia provides a made exhaustive paleontological collections, and per- valuable window into the geological and paleontological formed 87Sr/86Sr geochronology to document the transition history of northern South America during the Neogene. from the fully marine environment of the Jimol Formation Two major findings provide new insights into the Neogene (ca. 17.9–16.7 Ma) to the fluvio-deltaic environment of the history of this Cocinetas Basin: (1) a formal re-description Castilletes (ca. 16.7–14.2 Ma) and Ware (ca. 3.5–2.8 Ma) of the Jimol and Castilletes formations, including a revised formations. We also describe evidence for short-term pe- contact; and (2) the description of a new lithostratigraphic riodic changes in depositional environments in the Jimol unit, the Ware Formation (Late Pliocene). We conducted and Castilletes formations. The marine invertebrate fauna extensive fieldwork to develop a basin-scale stratigraphy, of the Jimol and Castilletes formations are among the richest yet recorded from Colombia during the Neogene. -
Genus/Species Skull Ht Lt Wt Stage Range Abalosia U.Pliocene S America Abelmoschomys U.Miocene E USA A
Genus/Species Skull Ht Lt Wt Stage Range Abalosia U.Pliocene S America Abelmoschomys U.Miocene E USA A. simpsoni U.Miocene Florida(US) Abra see Ochotona Abrana see Ochotona Abrocoma U.Miocene-Recent Peru A. oblativa 60 cm? U.Holocene Peru Abromys see Perognathus Abrosomys L.Eocene Asia Abrothrix U.Pleistocene-Recent Argentina A. illuteus living Mouse Lujanian-Recent Tucuman(ARG) Abudhabia U.Miocene Asia Acanthion see Hystrix A. brachyura see Hystrix brachyura Acanthomys see Acomys or Tokudaia or Rattus Acarechimys L-M.Miocene Argentina A. minutissimus Miocene Argentina Acaremys U.Oligocene-L.Miocene Argentina A. cf. Murinus Colhuehuapian Chubut(ARG) A. karaikensis Miocene? Argentina A. messor Miocene? Argentina A. minutissimus see Acarechimys minutissimus Argentina A. minutus Miocene? Argentina A. murinus Miocene? Argentina A. sp. L.Miocene Argentina A. tricarinatus Miocene? Argentina Acodon see Akodon A. angustidens see Akodon angustidens Pleistocene Brazil A. clivigenis see Akodon clivigenis Pleistocene Brazil A. internus see Akodon internus Pleistocene Argentina Acomys L.Pliocene-Recent Africa,Europe,W Asia,Crete A. cahirinus living Spiny Mouse U.Pleistocene-Recent Israel A. gaudryi U.Miocene? Greece Aconaemys see Pithanotomys A. fuscus Pliocene-Recent Argentina A. f. fossilis see Aconaemys fuscus Pliocene Argentina Acondemys see Pithanotomys Acritoparamys U.Paleocene-M.Eocene W USA,Asia A. atavus see Paramys atavus A. atwateri Wasatchian W USA A. cf. Francesi Clarkforkian Wyoming(US) A. francesi(francesci) Wasatchian-Bridgerian Wyoming(US) A. wyomingensis Bridgerian Wyoming(US) Acrorhizomys see Clethrionomys Actenomys L.Pliocene-L.Pleistocene Argentina A. maximus Pliocene Argentina Adelomyarion U.Oligocene France A. vireti U.Oligocene France Adelomys U.Eocene France A. -
A Fossil Fish Assemblage from the Middle Miocene of the Cocinetas Basin, Northern Colombia
bioRxiv preprint doi: https://doi.org/10.1101/2021.04.19.440491; this version posted April 20, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC 4.0 International license. A FOSSIL FISH ASSEMBLAGE FROM THE MIDDLE MIOCENE OF THE COCINETAS BASIN, NORTHERN COLOMBIA GUSTAVO A. BALLEN1,2,* CARLOS JARAMILLO2,3,4 FERNANDO C. P. DAGOSTA5 MARIO C. C. DE PINNA1 *Corre pondi"% a'(hor, %&*&++e",)-%.&$+.com, %&*&++e",)-&+'."$.usp.br 1M' eu de Zoolo%$& da U"$0ers$#&de de S1o P&'+o, S1o P&'+o, SP, Bra2$+ 2S.$() oni&" Tropi,&+ Re e&r,) Ins($('(e, P&"&.3, P&"&.3 3ISEM, U. Montpe++$er, CNRS, EP4E, IRD, Mont!e++$er, Fra",e 4De!&r(.e"( of Geolo%6, F&,'+(y of S,$e",e , U"$0ers$(y of S&+&.&",&, S&+&.&",&, S!&$" 5F&,'+#&de de Ci7",$& Biol8%$,& e A.*$e"(&$ , U"$0ers$#&de Federa+ da Grande Dourados, Dourados, MS, Bra2$+ Abstract: Fre )9&(er fos $+ fi h f&'"& ha0e bee" long used to i"5er pa ( dra$"&%e ,onne,($ons, a the6 are bounded by ph6 $,&+ fre )9&(er barr$ers. Here we s('#y a .$##+e M$ocene (15.0-–15.5 M&) fos $+ f&'"& (M&@&ra$!&o) from t)e C& ($++e(e For.&($on i" nor(hern Colom*$&, no9&#&6 we ( of the Ande . We re,ord the pre e",e of l'"%: he (Lepidosiren), pa,' (Mylossoma and Piaractus), ar.ore# ,&(: he (C&++$,)()6$#&e), a"# re#=(&$+ c&(: he (Phractocephalus). -
Mammalia, Notoungulata), from the Eocene of Patagonia, Argentina
Palaeontologia Electronica palaeo-electronica.org An exceptionally well-preserved skeleton of Thomashuxleya externa (Mammalia, Notoungulata), from the Eocene of Patagonia, Argentina Juan D. Carrillo and Robert J. Asher ABSTRACT We describe one of the oldest notoungulate skeletons with associated cranioden- tal and postcranial elements: Thomashuxleya externa (Isotemnidae) from Cañadón Vaca in Patagonia, Argentina (Vacan subage of the Casamayoran SALMA, middle Eocene). We provide body mass estimates given by different elements of the skeleton, describe the bone histology, and study its phylogenetic position. We note differences in the scapulae, humerii, ulnae, and radii of the new specimen in comparison with other specimens previously referred to this taxon. We estimate a body mass of 84 ± 24.2 kg, showing that notoungulates had acquired a large body mass by the middle Eocene. Bone histology shows that the new specimen was skeletally mature. The new material supports the placement of Thomashuxleya as an early, divergent member of Toxodon- tia. Among placentals, our phylogenetic analysis of a combined DNA, collagen, and morphology matrix favor only a limited number of possible phylogenetic relationships, but cannot yet arbitrate between potential affinities with Afrotheria or Laurasiatheria. With no constraint, maximum parsimony supports Thomashuxleya and Carodnia with Afrotheria. With Notoungulata and Litopterna constrained as monophyletic (including Macrauchenia and Toxodon known for collagens), these clades are reconstructed on the stem -
Pliocene), Falc6n State, Venezuela, Its Relationship with the Asterostemma Problem, and the Paleobiogeography of the Glyptodontinae ALFREDO A
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by RERO DOC Digital Library Pal&ontologische Zeitschrift 2008, Vol. 82•2, p. 139-152, 30-06-2008 New Glyptodont from the Codore Formation (Pliocene), Falc6n State, Venezuela, its relationship with the Asterostemma problem, and the paleobiogeography of the Glyptodontinae ALFREDO A. CARLINI, La Plata; ALFREDO E. ZURITA, La Plata; GUSTAVO J. SCILLATO-YANI~, La Plata; RODOLFO S,&,NCHEZ, Urumaco & ORANGEL A. AGUILERA, Coro with 3 figures CARLINI, A.A.; ZURITA,A.E.; SCILLATO-YANI~,G.J.; S.~NCHEZ,R. & AGUILERA,O.A. 2008. New Glyptodont from the Codore Formation (Pliocene), Falc6n State, Venezuela, its relationship with the Asterostemma problem, and the paleo- biogeography of the Glyptodontinae. - Palaontologische Zeitschrift 82 (2): 139-152, 3 figs., Stuttgart, 30. 6. 2008. Abstract: One of the basal Glyptodontidae groups is represented by the Propalaehoplophorinae (late Oligocene - mid- dle Miocene), whose genera (Propalaehoplophorus, Eucinepeltus, Metopotoxus, Cochlops, and Asterostemma) were initially recognized in Argentinian Patagonia. Among these, Asterostemma was characterized by its wide latitudinal distribution, ranging from southernmost (Patagonia) to northernmost (Colombia, Venezuela) South America. How- ever, the generic assignation of the Miocene species from Colombia and Venezuela (A.? acostae, A. gigantea, and A. venezolensis) was contested by some authors, who explicitly accepted the possibility that these species could corre- spond to a new genus, different from those recognized in southern areas. A new comparative study of taxa from Argen- tinian Patagonia, Colombia and Venezuela (together with the recognition of a new genus and species for the Pliocene of the latter country) indicates that the species in northern South America are not Propalaehoplophorinae, but represent the first stages in the cladogenesis of the Glyptodontinae glyptodontids, the history of which was heretofore restricted to the late Miocene - early Holocene of southernmost South America. -
Paleogene Glyptodontidae Propalaehoplophorinae (Mammalia, Xenarthra) in Extra-Patagonian Areas
Andean Geology 43 (1): 127-136. January, 2016 Andean Geology doi: 10.5027/andgeoV43n1-a07 www.andeangeology.cl PALEONTOLOGICAL NOTE Paleogene Glyptodontidae Propalaehoplophorinae (Mammalia, Xenarthra) in extra-Patagonian areas Alfredo E. Zurita1, Laureano R. González-Ruiz2, Angel R. Miño-Boilini1, Rafael Hersbt3, Gustavo J. Scillato-Yané4, Pedro Cuaranta1 1 Centro de Ecología Aplicada del Litoral (CECOAL-CONICET) y Universidad Nacional del Nordeste, Ruta 5, km. 2,5, 3400, CC 128 Corrientes, Argentina. [email protected]; [email protected]; [email protected] 2 Laboratorio de Investigaciones en Evolución y Biodiversidad (LIEB), Universidad Nacional de la Patagonia “San Juan Bosco” sede Esquel (UNPSJB), Centro de Investigaciones Esquel de Montaña y Estepa Patagónica (CIEMEP-CONICET), Roca 780, 9200, Esquel, Chubut, Argentina. [email protected] 3 Instituto Superior de Correlación Geológica (INSUGEO-CONICET), Las Piedras 201 7º/B, 4000 San Miguel de Tucumán, Argentina. [email protected] 4 Division Paleontología de Vertebrados, Museo de La Plata, Universidad Nacional de La Plata (CONICET), Paseo del Bosque, s/n 1900 La Plata, Buenos Aires, Argentina. [email protected] ABSTRACT. Paleogene records of Cingulata Glyptodontidae are scarce. The only well described comes from the Paleogene of Argentine Patagonia. Two subfamilies have been reported for that period: Glyptatelinae and Propalaehoplophorinae. Until this contribution, the latter taxon was geographically restricted to the locality of El Pajarito (Late Oligocene, Deseadan SALMA), Chubut province, Argentina. Here we present and describe the northernmost record of a Paleogene Propalaehoplophorinae. The material is represented by three associated osteoderms of the dorsal carapace from the Fray Bentos Formation (Late Oligocene, Deseadan SALMA) in the locality of Cueva del Tigre, Chajarí, Entre Ríos province, Argentina. -
Diversidad Con Alas
VI Congreso Latinoamericano de Paleontología de Vertebrados Diversidad con alas Villa de Leyva, Boyacá, Colombia Agosto 20 al 25 de 2018 PRESENCIA DE GRANASTRAPOTHERIUM EN EL MIOCENO DE TUMBES (NOROESTE DEL PERÚ): PRIMER REGISTRO DE ASTRAPOTERIO EN LA COSTA PERUANA Jean-Noël Martinez/ Instituto de Paleontología, Universidad Nacional de Piura / [email protected]/ Perú Darin Croft /Department of Anatomy, Case Western Reserve University, School of Medicine/ [email protected]/ USA El orden Astrapotheria reúne mamíferos ungulados de Sudamérica y Antártida cuyo registro se extiende cronológicamente desde el Paleoceno superior hasta el Mioceno medio. Los miembros más característicos de este orden, los Astrapotheriidae, conocidos desde el Eoceno, eran animales de gran tamaño con curiosos rasgos anatómicos que evocan los hipopótamos por la morfología de sus caninos sobresalientes y los tapires por la ubicación de sus fosas nasales, sugiriendo la presencia de una proboscis. Bien conocidos a través del continente sudamericano, su registro es muy escaso en el Perú, siendo mencionados en una localidad de la región amazónica y atribuidos a los géneros Xenastrapotherium y Granastrapotherium. La presencia conjunta de estos dos géneros en la denominada fauna local de Fitzcarrald evoca la asociación Xenastrapotherium kraglievichi - Granastrapotherium snorki del Mioceno medio de La Venta (Colombia) y marca el final de la historia evolutiva del orden Astrapotheria. Dos otros sitios ubicados a la frontera Perú- Brasil constituyen los registros geográficamente más cercanos a la fauna local de Fitzcarrald. El presente trabajo reporta el hallazgo de los maxilares de un astrapoterio en la región de Tumbes (extremo noroeste del Perú). El fósil arrancado por erosión natural a sus estratos de origen pudo ser fácilmente contextualizado.