Glaciers of Indiana is a full-color 26” by 34” poster that teaches about the immense sheets of ice that covered the state during the last Ice Age. Through field photographs and easy-to-understand diagrams, it explains how glaciers deposited sediments and changed Indiana’s landscape. A must for teachers and anyone who is interested in Indiana geology.

A travel drive comes loaded with 37 one-page articles about various topics in Indiana geology. Originally designed to be published as weekly newspaper articles, GeoNotes have been updated and are perfect for the classroom.

This set of 26 ABC cards define various geologic terms, including rocks, minerals, fossils, and earth science concepts. Perfect for kids and adults who want to learn more about geology. The cards are 5.5" by 8.5" and are printed in full color.

Born and educated in the Midwest, Carl Buckner Rexroad, Ph.D., (1925–2016) devoted his more than 60 year career investigating Paleozoic conodonts, their taxonomy, and their biostratigraphy. Initially affiliated with the Illinois State Geological Survey, he published his first abstract in 1955 on conodonts from the type Chester (upper Mississippian) in Illinois, followed a year later with a paper on that subject. He subsequently joined the Indiana Geological Survey, Indiana University, as a paleontologist and stratigrapher in 1961 and remained there for the next 54 years. During that time he collaborated with many other specialists and paleontologists from around the world, refining high-resolution interregional and intercontinental correlations of Paleozoic strata. As a teacher and mentor, he supervised university students, often co-authoring papers with them. Many students went on to successful careers themselves as conodont researchers. Rexroad’s legacy in Midwestern biostratigraphy, stratigraphy, and general geology is documented in the nearly 200 papers and abstracts he published, his last being shortly before his death in 2016. He leaves behind a unique reference collection for Silurian biostratigraphy in eastern North America, documenting the care, diligence, and skill that defined his long career.

The 2017 IGS Calendar features an 1878 hand-drawn map of Wyandotte Cave and illustrations of the various structures and formations within the cave. The 21 by 33 inch calendar is printed in full color on heavy poster paper.

Over the past decade, there has been growing recognition of markedly increased seismicity in the U.S. midcontinent. This observation has sparked interest in the possibility that earthquakes may be induced by human activities, specifically in association with wastewater injection. This concern led to numerous localized studies on the topic and in many parts of the central United States—including cases in Oklahoma, Ohio, Colorado, Texas, and Kansas—the occurrence of crustal earthquakes has been positively correlated with wastewater injection. In contrast, seismic events in Indiana have not been directly linked to subsurface injection activities to date. A study did suggest the possibility of small, injection-induced earthquakes near the Indiana-Illinois border, but with little direct evidence to test that claim. Since then, no detailed studies have been published on the subject, nor has there been a systematic collection of the data needed to make an assessment of the potential vulnerability of the state to future induced seismic activity. To assess the possibility that seismicity within the state may be associated with injection practices, we compiled a new database of injection pressure and volume data from 2004 through 2014, as well as recorded earthquakes in Indiana. The injection-well data are from the Indiana Department of Natural Resources, Division of Oil and Gas, while the earthquake data were compiled from the U.S. Nuclear Regulatory Commission and Advanced National Seismic System of the United States Geological Survey.

Using these data, a correlation in space and time between active injection wells and recorded earthquakes was explored. A spatial correlation between earthquakes and injection wells was defined as an earthquake epicenter having occurred within a given lateral distance from a wellhead that was actively injecting at the time of the earthquake. If the mapped earthquake epicenter occurred within 5 km (3.1 miles) of the surface coordinates of the injection wellhead, the correlation was considered high, and if it occurred within 15 km (9.3 miles), the correlation was considered moderate. Earthquakes that occurred outside a 15-km radius from active injection wells were considered to be not correlated. Results of this analysis show four earthquakes having high correlation and two having moderate correlation, all located in an area in southwestern Indiana with a large amount of oil and gas development activity. However, as correlation is not the same as causality, additional research should be undertaken to establish if a causal relationship between injection and seismicity indeed does exist.

Note: A printing fee will be applied for supplying a PDF print-out. The PDF download is free.

This useful directory lists all the known producers of industrial minerals in the state of Indiana. Commodities listed include cement, clay and shale, crushed stone, dimension limestone, dimension sandstone, gypsum, lime, peat, construction sand and gravel, industrial sand, and slag. Listings are arranged by commodity and county and include the following information, where applicable and available: company name, division, regional company address, telephone number, fax number, website address, e-mail address, mine or plant name, location, address, telephone number, fax number, e-mail address, , quadrangle, congressional land survey location (PLSS), products, geology, notes, Indiana Department of Transportation (INDOT) source numbers, Certified Aggregate Producer Program (CAPP) numbers, and U.S. Dept. of Labor Mine Safety and Health Administration (MSHA) identification numbers.

The related Story Map (igs.indiana.edu/IGSMap/?map=mineralproducers) gives industry information and shows locations of the various mines and plants with zoom capabilities. Clicking on an operation gives contact information. There are preset filters for commodity, mine, company, and county, but other filters are possible. Maps that are generated can be printed and saved. Data can also be downloaded to a CSV file and there are also links to additional sources of information.

Historically, much of the lower Pennsylvanian of Indiana has been considered to be generally nonmarine in origin. The presence of coals, the abundance of plant fossils, the lack of marine fossils, and the influential reports published by Potter and Siever during the 1950s and 1960s regarding sandstone deposition helped set the image of lower Pennsylvanian deposition as predominately fluvial with only minor marine influence. Recent work in Indiana, however, has revealed that many mudstone- dominated intervals were deposited under a tidal influence. In some cases, these marine-influenced intervals overlie coals that have sulfur contents of less than 1 percent.

The major purpose of this study of the conodonts of the Alum Cave Limestone Member of the Dugger Formation in Indiana is to enhance understanding of Desmoinesian (Pennsylvanian) biostratigraphy and paleoenvironments in the Illinois Basin. We collected samples from 25 localities in Gibson, Greene, Knox, Perry, Posey, Sullivan, Vanderburgh, and War-rick Counties in southwestern Indiana. A thin unnamed dark gray to black shale generally, but not uniformly, separates the Alum Cave stratigraphically from the underlying Springfield Coal Member of the Petersburg Formation. Idiognathodus, primarily juveniles, domi-nates the conodont fauna. Hindeodus and Neognathodus are uncommon. Adetognathodus and Idioprioniodus are rare. Notably absent are Diplognathodus, Ubinates, and Gondolella.