miércoles, junio 24, 2026
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Arroyo Seco: la joya arqueológica de Tres Arroyos que la ciencia no puede volver a contar

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ElTresArroyense
ElTresArroyensehttps://eltresarroyense.com
En este medio vas a encontrar entretenimiento, opiniones, análisis y comentarios sobre lo que está pasando, cuestiones sociales, culturales y locales, siempre con una mirada crítica y constructiva. Nuestras articulos editoriales e investigaciones buscan ser una voz que acompañe, cuestione y dialogue con nuestros lectores, aportando una perspectiva propia sobre lo que sucede en Tres Arroyos y en el mundo. Este es un lugar para pensar juntos y construir desde la palabra.

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A solo unos kilómetros de nuestra ciudad, bajo una lomada discreta y atravesada por el Arroyo Seco, duerme un tesoro que ningún tresarroyense debería olvidar. Allí, hace más de 14.000 años, los primeros hombres y mujeres que habitaron estas pampas dejaron huellas de su paso por la tierra. Un yacimiento arqueológico único en América, capaz de narrar 14 milenios de historia humana… hoy en silencio, esperando volver a enseñarnos todo lo que aún no sabemos.


El hallazgo que hizo historia

Gustavo Politis – Doctor en Ciencias Naturales

En 1977, el arqueólogo Gustavo Politis y su equipo –con apoyo de la UNICEN y el CONICET– comenzaron excavaciones en el lugar conocido como Arroyo Seco 2, ubicado a pocos kilómetros de Tres Arroyos (38°21′38″ S, 60°14′39″ O). Lo que encontraron no solo revolucionó la arqueología argentina: cambió la línea de tiempo de la presencia humana en Sudamérica.

Bajo el suelo aparecieron 44 esqueletos humanos, hombres, mujeres y niños, enterrados en rituales que datan de entre 8.500 y 5.000 años atrás. Junto a ellos, collares, hachas pulidas, morteros y objetos que hablan de respeto, espiritualidad y vínculos familiares en tiempos en los que ni siquiera existía la escritura.

En las capas más profundas, hallaron herramientas de piedra asociadas a megafauna extinta –como milodones y megaterios–, pruebas concretas de que los primeros pobladores convivieron y cazaron animales gigantes hace más de 12.000 años. Es un registro único que muestra cómo vivían, cazaban, se movían y hasta cómo se relacionaban entre sí aquellos primeros seres humanos de la pampa bonaerense.


Un valor científico sin precedentes

Arroyo Seco es uno de los yacimientos más antiguos y completos de Latinoamérica. Solo se excavó el 20% del sitio, lo que significa que el resto del terreno podría esconder hallazgos capaces de cambiar nuevamente lo que sabemos sobre los primeros habitantes del continente.

Las investigaciones revelaron algo más: las piedras usadas para fabricar herramientas provenían de lugares como Sierra de la Ventana, Tandilia y la costa atlántica. Esto demuestra que, hace más de 10.000 años, existían redes de intercambio y movilidad humana que cubrían cientos de kilómetros.

Durante décadas, delegaciones escolares, turistas y curiosos visitaron el lugar y el Museo Mulazzi, creado en 1979 para conservar y mostrar los hallazgos. Para miles de chicos tresarroyenses, ese sitio fue la primera ventana al pasado más remoto de nuestra región.


La declaración y el cierre del sitio

En 2022, tras años de reclamos de comunidades indígenas, el lugar fue declarado Sitio de la Memoria de los Pueblos Originarios. La decisión buscó devolver los restos humanos al suelo donde descansaron durante milenios, respetando la cosmovisión de sus descendientes. Nadie puede discutir el valor simbólico de ese reconocimiento: ese suelo es un cementerio, y la memoria de sus ancestros merece respeto.

Pero la otra cara de la historia es que, desde entonces, el sitio quedó cerrado a la investigación y a la educación pública. Las excavaciones se detuvieron. Los materiales hallados fueron retirados del museo para su reentierro. Y así, uno de los registros arqueológicos más importantes del continente dejó de ser fuente de conocimiento para la ciencia y para las nuevas generaciones.


El dilema que nos interpela como comunidad

El sitio arqueológico Arroyo Seco II está compuesto por varias capas de materiales de sucesivas ocupaciones humanas

Arroyo Seco no es un campo más. Es la prueba tangible de que estas pampas fueron hogar de familias humanas hace miles de años, que cazaban gigantes, formaban redes sociales y enterraban a sus muertos con rituales complejos. Y aún hoy, bajo ese suelo, podrían estar esperando descubrimientos que cambien todo lo que sabemos de nuestra historia.

¿Podemos encontrar un equilibrio? ¿Podemos respetar la memoria ancestral sin condenar a la ciencia y a nuestros hijos a perder este legado? Como dijo el propio Politis: “Excavamos apenas un 20% del sitio. Lo que falta por descubrir podría ser mucho más importante que lo que ya encontramos”.

Cerrar Arroyo Seco al estudio es como quemar un libro de 14.000 años sin terminar de leerlo. Es dejar que la tierra se trague respuestas que podrían conectar nuestro presente con los primeros pasos del ser humano en estas pampas.

Gustavo Politis, junto a un esqueleto encontrado en “Arroyo Seco 2” (Marzo 2010)

Hoy, el silencio cubre Arroyo Seco. Pero no tiene por qué ser para siempre. Hay una historia bajo ese suelo que todavía quiere ser contada. Y quizás sea momento de luchar para que vuelva a ver la luz.

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