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This article is an approach to the processes that influence in the formation of the paleontological record in the hills of Eastern Tandilia Range (Pampean Region of Argentina). The associations of fossil remains and the bony assemblage of the current surface, both of rocky shelters, are compared. The agents of incorporation of bones to the shelters, the causes of natural and human alterations, and the indicators of stability of the fossil record are described. The diversity and specific richness, the quantity of deposited bony remains, and the quality of the record is analyzed. Its concludes that: in the rocky repairs of Eastern Tandilia the causes that generate bony accumulations presently are not analogous to those of the last 11,000 years. The only exception is the deposit of bones coming from pellets of rapacious birds. This lack of agreement is due to: the strong human influences in the formation of the fossil record that caused deposits with more quantity of bones and diversity of species in the present-day record. This last one, it is only conditioned by natural factors.  A modo de una primera aproximaci&#243;n a los procesos que condicionan la formaci&#243;n del registro paleontol&#243;gico en las sierras de Tandilia Oriental (Regi&#243;n Pampeana de Argentina) se comparan las asociaciones de restos f&#243;siles de reparos rocosos con los conjuntos &#243;seos de la superficie actual relevados en los mismos &#225;mbitos. Se describen los agentes de ingreso de huesos a los reparos, las causas de alteraciones naturales y antr&#243;picas, y los indicadores de estabilidad del registro f&#243;sil. Se analiza la diversidad y riqueza espec&#237;fica, la cantidad de restos &#243;seos depositados, y la calidad del registro. Se concluye que en los reparos rocosos de Tandilia Oriental las causas que generan acumu-laciones &#243;seas en el presente no son an&#225;logas a las de los &#250;ltimos 11.000 a&#241;os. La &#250;nica excepci&#243;n es el dep&#243;sito de huesos provenientes de egagr&#243;pilas de aves rapaces. Esta falta de concordancia se debe a: la fuerte influencia antr&#243;pica en la formaci&#243;n del registro f&#243;sil, que ocasion&#243; dep&#243;sitos con mayor cantidad de huesos y diversidad de especies que en el registro actual, el cual est&#225; condicionado s&#243;lo por factores naturales

Acumulaciones de restos óseos en reparos rocosos de las sierras de Tandilia oriental, Argentina