Benjamin Linzmeier

Benjamin Linzmeier
University of South Alabama | USA · Department of Earth Sciences

PhD

About

33
Publications
7,217
Reads
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181
Citations
Additional affiliations
September 2017 - September 2017
Northwestern University
Position
  • Fellow
May 2007 - August 2007
Smithsonian Institution
Position
  • Research Intern
May 2006 - August 2006
The Mammoth Site
The Mammoth Site
Position
  • Summer Intern

Publications

Publications (33)
Article
Researchers on the cutting edge of geochemistry are tracing Earth’s history through the clues recorded in tiny mineral crystals. Often, they must work with the microscopic (or nanoscopic) features in rare, hard-won specimens to pull apart the complete history of the mineral’s formation. Even in large pieces of rock, microscopic variability may be d...
Article
Full-text available
Carbon dioxide release during Deccan Traps volcanism and the Chicxulub impact likely contributed to the Cretaceous-Paleogene (K-Pg) mass extinction; however, the intensity and duration of CO2 input differed between the two events. Large and rapid addition of CO2 to seawater causes transient decreases in pH, [CO32–], and carbonate mineral saturation...
Article
Ediacaran-aged (635–541 million years ago) marine sediments contain a large negative carbon isotope (δ13C) excursion, in which carbonate δ13C values reach −12‰ (VPDB). Known as the ‘Shuram’ excursion, many workers have interpreted this δ13C record as an unprecedented perturbation to the global carbon cycle, leading to speculation about a causal con...
Article
Full-text available
We employed the widely-tested biophysiological modeling software, Niche Mapper™ to investigate the metabolic function of the Late Triassic dinosaurs Plateosaurus and Coelophysis during global greenhouse conditions. We tested a variety of assumptions about resting metabolic rate, each evaluated within six microclimate models that bound paleoenvironm...
Article
Full-text available
Heteromorphs are ammonoids forming a conch with detached whorls (open coiling) or non-planispiral coiling. Such aberrant forms appeared convergently four times within this extinct group of cephalopods. Since Wiedmann's seminal paper in this journal, the palaeobiology of heteromorphs has advanced substantially. Combining direct evidence from their f...
Article
Full-text available
Paleotemperatures based on δ18O values derived from belemnites are usually “too cold” compared to other archives and paleoclimate models. This temperature bias represents a significant obstacle in paleoceanographic research. Here we show geochemical evidence that belemnite calcite fibers are composed of two distinct low-Mg calcite phases (CP1, CP2)...
Conference Paper
High Spatial-resolution Assessment of Diagenesis and Primary Isotopic Variability in Maastrichtian Molluscan Carbonates from Antarctica - Benjamin Linzmeier, Thomas Tobin, Peter Ward, Ian Orland, Daniella Assing, Kouki Kitajima, Phillip Gopon, Brian Huber, Shanan Peters, John Valley
Preprint
Full-text available
We employed the widely-tested biophysiological modeling software, Niche Mapper™ to investigate the metabolic function of Late Triassic dinosaurs Plateosaurus and Coelophysis during global greenhouse conditions. We tested them under a variety of assumptions about resting metabolic rate, evaluated within six microclimate models that bound paleoenviro...
Article
Serially sampled oxygen isotope ratios (δ18O) from fossil and modern cephalopods may provide new insight into the behavior and longevity of individuals. Interpretation of these data is generally more difficult than similar data from bivalves or brachiopods because the measured δ18O from shell combines both seasonal change and depth change over the...
Article
Ammonites have disparate adult morphologies indicative of diverse ecological niches, but ammonite hatchlings are small (~1 mm diameter), which raises questions about the similarity of egg incubation and hatchling life mode in ammonites. Modern Nautilus is sometimes used as a model organism for understanding ammonites, but despite their outward simi...
Preprint
Serially sampled δ18O from fossil and modern cephalopods may provide new insight into the behavior and longevity of individuals. Interpretation of these data is generally more difficult than similar data from bivalves or brachiopods because the measured δ18O from shell combines both seasonal change and depth change over the life of an individual. I...
Conference Paper
Full-text available
Carbonate skeletons of fossil marine organisms are widely used for the reconstruction of past environments. Specifically , the geochemistry of Jurassic and Cretaceous belemnite rostra, a mineralized internal structure, is commonly applied to reconstruct paleoseawater properties. The low-Mg calcite rostra are commonly assumed to be precipitated in o...
Conference Paper
Full-text available
Carbonate skeletons of fossil marine organisms are widely used for the reconstruction of past environments. The geochemistry of Jurassic and Cretaceous belemnite rostra, a mineralized internal structure, is commonly applied to reconstruct palaeoseawater properties such as surface temperature from oxygen isotope ratios. The low-Mg calcite rostra are...
Conference Paper
Full-text available
Ammonites are the most iconic of extinct mollusks. Their wide spatial distribution and biostratigraphic utility make them ideally suited to investigate past climate. To date, stable isotope analyses of ammonites have focused on adult shells that can be sampled by bulk methods and have suggested adults had a nektobenthic mode of life. Eggs and hatch...
Conference Paper
The strong contrast between egg size and hatchling ecology of ammonoids and nautiloids is thought to explain why ammonoids were more vulnerable to extinction and more prone to diversification than nautiloids throughout the fossil record. Nautiloids had large slowly developing eggs (20-30 mm) and nektobenthic juveniles and ammonoids had small eggs (...
Conference Paper
Full-text available
Local geological knowledge is usually not highlighted in general geology textbooks that are used in high schools, and thus they do not incorporate hands-on learning opportunities that can engage and inspire new geologists. University faculty with expertise in local geology can disseminate knowledge, but must balance outreach with the demands of tea...
Article
Carbonate skeletons of fossil marine organisms are widely used to reconstruct palaeoceanographic parameters. Specifically, the geochemistry of Jurassic and Cretaceous belemnite rostra is traditionally interpreted to represent near sea-surface seawater properties. More recently, an increasing number of workers, have reported significant scatter in g...
Article
Full-text available
Nautilus is often used as an analogue for the ecology and behavior of extinct externally shelled cephalopods. Nautilus shell grows quickly, has internal growth banding, and is widely believed to precipitate aragonite in oxygen isotope equilibrium with seawater. Pieces of shell from a wild-caught Nautilus macromphalus from New Caledonia and from a N...
Data
SEM and CLFM images of transects on Nautilus belauensis, AMNH 102555. (PDF)
Data
Table of all SIMS analyses including rejected values for sample Nautilus macromphalus, AMNH 105621. Complete data table of analyses in the outer prismatic layer of the wild-caught Nautilus macromphalus including bracketing standards and aragonite standard. (XLSX)
Data
Table of all SIMS analyses including rejected values for sample Nautilus belauensis, AMNH 102555. Complete data table of analyses in the outer prismatic layer of the aquarium-reared Nautilus belauensis including bracketing standards and aragonite standard. (XLSX)
Conference Paper
Recent work suggests that the Chicxulub bolide impact was not the only significant mechanism driving the Cretaceous-Paleogene (K/Pg) mass extinction event (~65.5 Ma) and that there must have been several other mechanisms including climate change which also contributed to this event. The sequence, nature and magnitude of climate change approaching t...
Conference Paper
Full-text available
In situ microanalytical techniques have become faster, more precise, and have seen wider use in the geosciences over the last two decades. Individual 2.5 cm diameter samples may have large data sets from in situ microanalytical instruments (e.g. SIMS, EPMA, LA-MS) and suites of images from multiple techniques (e.g. cross polarized light, plane pola...
Conference Paper
Full-text available
General geology textbooks used in high schools have a global or national audience, and thus do not incorporate opportunities for hands-on local scientific inquiry that greatly benefit the learning experience. University geoscientists with expertise in local geology can disseminate knowledge to high schools, but must balance such outreach with other...
Conference Paper
The Buckhorn Asphalt quarry, south of Sulfur, Oklahoma in the Arbuckle Mountains, contains an asphalt-impregnated fossil Lagerstätte that preserves the original aragonite mineralogy of a diverse middle Pennsylvanian (Desmoinesian) marine assemblage dominated by molluscs. Orthoconic nautiloids are preserved as segments of the phragmocone and are ver...

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Projects

Projects (2)
Project
Cephalopod ecology can be inferred from stable isotope signatures recorded in biomineralized materials such as shell or statoliths. This body of work uses those signatures to explicitly understand the ecology or behavior of modern and extinct cephalopods.
Project
Develop and refine a workflow for the integration of microanalytical datasets in QGIS. This platform facilitates data-sharing between collaborators, visualization for figures, and creation of high-quality supplemental information while being time-efficient. Future work will integrate the platform with databases in the geosciences.