Kathleen A. Campbell

TL;DR: The origin of modern vent-seep biota has been attributed to either enhanced accumulation of Paleozoic and Mesozoic relics, or migration of various invertebrate groups into vent and seep environments during the Phanerozoic as discussed by the authors.

TL;DR: More than a dozen hydrocarbon seep-carbonate occurrences in late Jurassic to late Cretaceous forearc and accretionary prism strata, western California, accumulated in turbidite/fault-hosted or serpentine diapir-related settings were analyzed for their petrographic, geochemical and palaeoecological attributes, and each showed a three-stage development that recorded the evolution of fluids through reducing-oxidizing-reducing conditions.

TL;DR: In this article, the authors describe the evolution of silica sinters over the last 10,000 to 50,000 years, from non-crystalline opal-A particles to poorly crystalline Opal-CT and/or opalC.

TL;DR: New discoveries of hot spring deposits including geyserite, sinter terracettes and mineralized remnants of hot springs pools/vents are presented, all of which preserve a suite of microbial biosignatures indicative of the earliest life on land.

TL;DR: It is hypothesized that, given the lack of long-term, continuous habitability, if martian life developed, it was (and may still be) chemotrophic and anaerobic, and the biogenicity of these signatures is evaluated by comparing them to possible abiotic features.