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. 2016 Jul 6;7:1064. doi: 10.3389/fmicb.2016.01064

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Copyright © 2016 Warden, Casaburi, Omelon, Bennett, Breecker and Foster.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Photosynthetic biosignatures in thrombolitic mats and thrombolite cores. Observed carbonate δ¹³C_CaCO3 values (blue box) are higher than the maximum theoretical equilibrium δ¹³C_CaCO3 value (red box). The maximum theoretical equilibrium δ¹³C_CaCO3 value was calculated from the highest observed δ¹³C_DIC value (yellow box) measured among groundwater and lake water samples.