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. 2021 May 11;9:e11386. doi: 10.7717/peerj.11386

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©2021 Gonzalez-Pimentel et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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Representative Field Emission Scanning Electron Microscopy images of the studied samples, depicting (A,B) Clusters of Actinobacteria-like cells with spiny surface ornamentation in the mucous formation of ochre color (MZ03-2B); (C) Microbial filaments probably of Actinobacteria in the ochre soft stalactite (MZ03-3C); (D) Hollow bacterial filament on the sample surface of the ochre soft stalactite (MZ03-3C); (E) Prosthecate-like bacterial cell in the ochre mucous deposit on a rock crack with water runoff (MZ03-8H); (F) Dense network of nano-scaled filaments in the ochre mucous deposit on a rock crack with water runoff (MZ03-8H); (G) Mass of interwoven filaments, and (H) Coccoid-shaped cells with smooth surfaces in the mineral formation with abundant moonmilk deposits (MZ03-10J).