tetlalli.

Headword: 
tetlalli.
Principal English Translation: 

gravelly soil, rocky soil
[Source: Barbara J. Williams, "Pictorial Representation of Soils in the Valley of Mexico: Evidence from the Codex Vergara," Geoscience and Man 21 (1980), 51–62; see p. 57. She cites Sahagún.]

Attestations from sources in English: 

“...tetlalli, gravelly soil (Sahagún, 1963, p. 253).” (p. 57)
Barbara J. Williams, "Pictorial Representation of Soils in the Valley of Mexico: Evidence from the Codex Vergara," Geoscience and Man 21 (1980), 51–62.