A5048623350- Paleontology and Stratigraphy of Fossils
- Geochemistry and Elemental Analysis
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Calcium Carbonate Crystallization and Inhibition
- Genomics and Phylogenetic Studies
- Evolution and Paleontology Studies
- Geological and Geophysical Studies
- Ocean Acidification Effects and Responses
- Microbial Community Ecology and Physiology
- Geological Modeling and Analysis
- Paleontology and Evolutionary Biology
- Higher Education Practises and Engagement
- Oceanographic and Atmospheric Processes
Pennsylvania State University
2019-2023
Carbonate sediments and rocks are valuable archives of Earth's past whose geochemical compositions inform our understanding surface evolution. Yet carbonates also reactive minerals often undergo compositional alteration between the time deposition sampling analysis. These changes may be mineralogical, structural, and/or chemical, they broadly referred to as diagenesis. Building on work over 40 years, we present an overview key carbonate diagenesis terminology a process-based framework for...
Significance “Dead clade walking” refers to fossil groups that suffer major drops in their biodiversity at a mass extinction but do not completely disappear from the record. Why these were able survive rediversify remains relative mystery. Controls on timing of eventual are additionally unclear. By gauging frequency and cause dead clades walking, we may be better understand how events have shaped evolution animal lineages over Earth history.
Abstract Whiting events—the episodic precipitation of fine‐grained suspended calcium carbonates in the water column—have been documented across a variety marine and lacustrine environments. Whitings likely are major source carbonate muds, constituent limestones, important archives for geochemical proxies Earth history. While several biological physical mechanisms have proposed to explain onset these events, no consensus has reached thus far. Fayetteville Green Lake (New York, USA) is...
Abstract Late Devonian (Famennian) marine successions globally are typified by organic‐rich black shales deposited in anoxic and euxinic waters the cessation of shelf carbonate sedimentation. This global ‘carbonate crisis’, known as Hangenberg Event, coincides with a major extinction reef‐building metazoans perturbations to carbon cycle, evidenced positive carbon‐isotope excursions up 4‰. It has been suggested that authigenic carbonate, formed cements sedimentary pore spaces during early...
Abstract Biogeochemical cycling of sulfur is relatively understudied in terrestrial environments compared to marine environments. However, the comparative ease access, observation, and sampling settings can expand our understanding organisms processes important modern cycle. Furthermore, these sites may allow for discovery useful process analogs ancient sulfur‐metabolizing microbial communities at times Earth's past when atmospheric O 2 concentrations were lower sulfide was more prevalent...