
Claudia JohnsonIndiana University Bloomington | IUB · Department of Geological Sciences
Claudia Johnson
Ph.D. Geological Sciences
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44
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Introduction
Skills and Expertise
Additional affiliations
September 1989 - December 1993
January 2014 - present
Publications
Publications (44)
This study provides the first focused investigation of rudist bivalves from the Upper Cretaceous of the Gulf Coastal Plain (GCP) in the southern US and previously undescribed specimens from the Flor de Alba Limestone Member of the Pozas Formation in Puerto Rico. Identified rudists from the GCP comprise the Monopleuridae, including Gyropleura , as w...
Characterizing deep-sea coral biodiversity is essential to evaluate the current state of deep-sea ecosystems and to assess vulnerability to anthropogenic threats such as offshore drilling and ocean acidification. Thousands of deep-sea coral records from the past 6 decades are compiled in the publicly accessible NOAA database, but few large-scale an...
Conodont fossils are highly valuable for Paleozoic biostratigraphy and for interpreting evolutionary change, but identifying and describing conodont morphologies, and characterizing gradual shape variation remain challenging. We used geometric morphometric (GM) analysis to conduct the first landmark-based morphometric analysis of the biostratigraph...
The challenges presented by data to scientific inquiry and hypothesis testing in an oceanographic setting are not new problems. Indeed, the challenges are at least a century old. The problems are not with the data itself, but rather with the attention to the management of the "data ecology" in the information systems. Data needs to be accessible as...
The rich record of vertebrate, hominin and archaeological remains recovered from Olduvai Gorge in northern Tanzania stands in stark contrast to the largely unexplored macroinvertebrate record from the region. Here we examine fossil malacofauna from Olduvai Gorge, inclusive of new discoveries and previous reports, and survey their potential as paleo...
The collaborative nature of the (paleo)biological community requires institutions, especially small ones, to push the boundaries of the practically achievable in order to meet quadruple goals of curation, in-house research, data dissemination, and outreach. To meet these goals, we collaborated with partners in information technology and library sci...
Comprehension of geologic time does not come easily, especially for students who are studying the earth sciences for the first time. This project investigated the potential success of two teaching interventions that were designed to help non-science majors enrolled in an introductory geology class gain a richer conceptual understanding of the geolo...
Outcrops of the Pennsylvanian Mansfield Formation in Martin County, Indiana, were examined to integrate sedimentological, geochemical, and paleobiological data for refinement of local paleoenvironment and age designation. The stratigraphically older HR-150 outcrop contains in the lower section a combination of wavy-, flaser-, and ripple-bedded silt...
This Scholarship of Teaching and Learning project discusses the effectiveness of using distance metaphor-building activities along with a case study exam to help undergraduate nonscience majors understand and apply geologic time. Using action research, we describe how a scholarly teacher integrated previously published and often-used teaching pract...
Water samples from Xikuangshan (China), the world largest antimony (Sb) mine with a Sb mining and smelting history of more than 200 years, were analyzed. These water samples ranged from stream water in the vicinity of the mining and smelting area that received seepage from ore residues to the underground mine-pit drainage. The concentrations of tot...
A diamictite unit 9.2m thick and 1.5×1.0km in aerial extent lies unconformably on siliciclastics of the Santa Rosa Group in the Maya Mountains of Belize. The diamictite has an irregular scour base with 1.5m of erosional relief. Matrix accounts for 24–27% of the deposit and consists of coarse sand to clay-sized particles of lithics and mineral grain...
Deltaplax new genus, Deltaplax burdicki new species, and Deltaplax dellangeloi new species (Mollusca, Polyplacophora, Neoloricata, Multiplacophora) from the Mississippian Lower Buffalo Wallow Group (Chesterian) of Indiana, USA are described. The new genus is established by one partially articulated and one associated specimen with marginal fringes...
Taphonomic analyses of modern Katharina tunicata and Mopalia muscosa valves (Mollusca, Polyplacophora) collected from San Juan Island, Washington, USA, demonstrate that preservation potential of chitons varies by species and locality. Damage levels observed in the valves reflect differences in extrinsic environmental conditions, but intrinsic chara...
The chiton fossil record is richer than previously reported in the literature. A newly compiled database comprised of Cambrian to Pleistocene fossil chitons totals 2594 occurrences of 900 species. Of the 900, 430 are named species known only as fossils, 123 are extant species that also have a fossil record, and 247 are indeterminate taxa. Most of t...
Our modern world has a tropical region that contains reefs, rain forests, and the highest biodiversity on the globe. From
the hot tropics to the cold polar regions, a series of convection cells drive today’s atmospheric circulation. In the oceans,
high-density water masses from the polar regions source the thermohaline, subsurface circulation of ou...
Upper Jurassic-Lower Cretaceous sponge biostromes and bafflestone mounds were common and widespread in European temperate to tropical marine environments. They declined markedly during the Late Cretaceous. Most sponge frameworks were paucispecific and ecologically simple, with only basic levels of succession or tiering. The occurrence of ecological...
A series of atmospheric general circulation model simulations has been completed for the mid-Cretaceous to test the sensitivity of the oceanic boundary forcings (wind stress, moisture and heat fluxes) to major climatic factors. These GENESIS model experiments have been examined on a regional scale to determine the significance of carbon dioxide con...
Patterns of surface current movements are interpreted for the Cretaceous in the Caribbean and Gulf of Mexico regions from a proxy paleobiologic database. Documented as generic presence/absence data points, the database was subjected to Monte Carlo simulations and 1,000 simulations were run per locality pair to generate indices of similarity among l...
Biologically defined fluctuations in Cretaceous tropical reef boundaries of the Caribbean region record a dynamic rather than stable environmental history. These fluctuations may be related to major thermal changes resulting from ocean heat transport. With simultaneous poleward movement of surface and subsurface waters on sea-level highstands, the...
The Cretaceous marine basins of northern South America, in their evolution, record a dynamic interplay between regional and plate tectonics, sealevel history, changing paleo-ocean/paleoclimate systems, and the rates/patterns of sedimentation driven by both allocyclic and autocyclic processes. Regional interpretation of these complex interactions; a...