The phrase "autochthonous material" is correct and usable in written English.
It can be used in contexts related to geology, anthropology, or ecology to refer to materials or organisms that are native to a specific place.
Example: "The researchers collected samples of autochthonous material to study the local biodiversity and its evolution over time."
Alternatives: "indigenous material" or "native material".
Several specific mineralogical markers of the sandy fraction and the clayey fraction allow us to distinguish autochthonous materials emanating from proximal hillsides upstream of the river, and then to follow the increase of these allochthonous particles during the second half of the Holocene.
Sediment deposition, along with accumulation of autochthonous organic material, contributes to the vertical accretion necessary for a marsh surface to maintain its elevation above mean sea level as sea level rises (Reed 1989; Morris et al. 2002; Mudd et al. 2009).
Both systems share common characteristics such as the presence of reduced chemical compounds (H2S and hydrocarbonates), local hypoxia or even anoxia, a high abundance and metabolic activity of bacterial populations, and the production of autochthonous, organic material by chemoautotrophic bacteria.
The Corg from continuous meadows was also more 13C enriched, which suggests that a high proportion of the carbon was derived from plant material (autochthonous sources); in contrast in patchy meadows (especially in a sand matrix), lower δ13C values indicated a higher contribution from allochthonous sources (mainly suspended particulate organic matter, SPOM).
The micritic morphology and coarse crystalline nature of the cementing materials strongly suggest autochthonous and allochthonous origin of the cementing materials, respectively.
Biogeochemical cycling in these creeks fluctuates with hourly, daily, and seasonal changes in tidal exchange, freshwater and material inputs, and autochthonous primary production.
The origins of the cementing materials were both autochthonous and allochthonous.
Within the excavation pit the recovered elements present a mixture of skeletal material in near-primary (autochthonous) and secondary (re-deposited) context.
