Integrating Research and Education > Montana-Yellowstone Geologic Field Guide Database > Search the Database

Search the Database

Use this page to search our collection of educationally-useful geologic field guides and road logs in Montana and Yellowstone. You may search the database by entering a keyword to search or choosing one of the listed terms for geologic topic, geographic location, or geologic province.


Help

Show all pages

Current Search Limits

Geologic Province

showing only Montana Plains Show all Geologic Province

Results 1 - 10 of 14 matches

Field Guide; Belt Butte and Tiger Butte part of MT Field Guides
This field trip extends east from Great Falls across rolling glacial plains to the summit of Belt Butte, where its formation and the collapse structure adjacent to it will be discussed. In addition, the Tiger Butte laccolithic intrusion, contact metamorphic effects, associated dikes, and structure resulting from the intrusion will be examined.

Topics: Fossils, Hazards, Resources, Surficial geology, Igneous rocks, Sedimentary rocks, Metamorphic rocks
Geographic Location: North-Central Montana
Geologic Province: Montana Plains

Field Guide; North Moccasin and Judith Mountains part of MT Field Guides
The emphasis of this field trip is to examine gold mineralization hosted in karsts breccias at the Kendall mining district and the relationship between intrusives, Paleozoic sedimentary rocks and mineralization in the Judith Mountains.

Topics: Surficial geology, Hydrology, Sedimentary rocks
Geographic Location: North-Central Montana
Geologic Province: Montana Plains

Field Guide; Little Rocky Mountains part of MT Field Guides
This fieldtrip examines deformed Paleozoic sedimentary rocks on the margins of the Little Rocky Mountains, Tertiary intrusive rocks (porphyrys, magmatic-hydrothermal breccias, and dikes), and associated mineralization.

Topics: Fossils, Resources, Structures, Igneous rocks, Sedimentary rocks, Metamorphic rocks
Geographic Location: North-Central Montana
Geologic Province: Montana Plains

Field Guide; Little Rocky Mountains part of MT Field Guides
This fieldtrip examines deformed Paleozoic sedimentary rocks on the margins of the Little Rocky Mountains, Tertiary intrusive rocks (porphyrys, magmatic-hydrothermal breccias, and dikes), and associated mineralization.

Topics: Metamorphic rocks, Sedimentary rocks, Igneous rocks
Geographic Location: North-Central Montana
Geologic Province: Montana Plains

Bones and Rocks of the Upper Cretaceous Two Medicine-Judith River Clastic Wedge Complex, Montana part of MT Field Guides
The purpose of this field trip is to provide an overview of the paleontologic, stratigraphic, and paleoenvironmental aspects of the Upper Cretaceous Two Medicine-Judith River clastic wedge in western Montana. Strata of the Two Medicine Formation yielded the first evidence of such dinosaur social behavior as nest construction and parental care, and have provided important information concerning the processes of bonebed formation in the fossil record. The correlative Judith River Formation in Montana has yielded an abundant and diverse dinosaur fossil record primarily preserved as transported and concentrated accumulations of vertebrate remains ("microsites"). The geology and paleontology of four fossil localities [Seven Mile Hill, Shield's Crossing, Willow Creek Anticline (Egg Mountain), and the Badger Creek/Two Medicine River confluence] are described, but precise details concerning the locations of the sites are not given in the field guide.

Topics: Fossils, Sedimentary rocks
Geographic Location: North-Central Montana
Geologic Province: Montana Plains

Stratigraphy and Sedimentology of the Paleocene Fort Union Formation along the Powder River, Montana and Wyoming part of MT Field Guides
The Paleocene Fort Union Formation in the Powder River Basin in Montana and Wyoming and adjoining areas contains a large number of very thick, closely spaced coal beds that make up some of the largest coal reserves in the United States. The main purpose of this field guide is to provide a knowledge of the stratigraphy, fluvial facies sequences, and depositional environments of portions of this coal resource at three main localities along the Powder River. Field data from measured sections and outcrop descriptions are synthesized into a depositional model for the origin of the Tongue River Member of the Powder River Formation.

Topics: Resources, Sedimentary rocks, Fossils
Geographic Location: Southeast Montana
Geologic Province: Montana Plains

Depositional Surfaces in the Eagle Sandstone at Billings, Montana part of MT Field Guides
Marine shelf sandstones and barrier bars are commonly formed by lateral accretion of sand bodies with time lines inclined to the formation boundaries. Shelton (1965) described low-angle inclined bedding in the lowermost sandstone unit of the Eagle Sandstone at Billings, Montana. He recognized these beds as shoreface accretion surfaces of a barrier bar and likened them to those found on present-day Galveston Island, Texas. The Billings location provides an excellent opportunity to examine an important hydrocarbon reservoir rock of the Northern Rocky Mountain region.

Topics: Resources, Sedimentary rocks, Fossils
Geographic Location: South-Central Montana
Geologic Province: Montana Plains

Upper Cretaceous-Paleocene Sequence, Bug Creek Area, Northeastern Montana part of MT Field Guides
Study of the Late Cretaceous-Paleocene sequence in the Bug Creek Area and the rest of the Fort Peck Fossil Field has contributed greatly to our understanding of the paleoecology and stratigraphy of dinosaur extinction and the primary radiation of Tertiary placental mammals. The area features at least 133 species of spores and pollen, 93 species of Cretaceous vertebrates (including 30 species of mammals and 19 species of dinosaurs), 24 species of Paleocene mammals, as well as the oldest ungulate and primate specimens ever found. Fossil leaves and wood have also been described. The area also includes well-studied localities of the K/T boundary containing Ir-rich clay and shocked quartz. No section of terrestrial sediments across the K/T boundary has been studied in as many ways as this one. This has been and will continue to be a major locality at which to study evidence for various hypotheses about the events at the K/T boundary.

Topics: Sedimentary rocks, Fossils
Geographic Location: Northeast Montana
Geologic Province: Montana Plains

Great Falls to Wolf Creek (Via I-15) part of MT Field Guides
Great Falls is underlain by the Lower Cretaceous Kootenai Formation (Aptian), a series of red sandstones and shales which is considered to have been deposited in a "mostly" nonmarine environment. The city is on a crest of a broad northwest-plunging anticline called the South Arch, which lies just east of the Montana Thrust Belt. As we drive southwestward towards the Montanta Thrust Belt today, we will travel off the northwest flank of the South Arch. This will take us gradually from Lower Cretaceous to Upper Cretaceous outcrops until we reach the edge of the mountain front.

Topics: Structures, Igneous rocks, Sedimentary rocks
Geographic Location: North-Central Montana
Geologic Province: Montana Plains, Central Rocky Mountains Foreland Province, Rocky Mountain Fold-Thrust Belt

Geology of the Highwood Mountains, Montana: A Survey of Magma Types and Sources part of MT Field Guides
The Highwood Mountains represent a dissected Eocene volcanic and intrusive complex composed of latites and highly potassic, mafic to felsic igneous rocks. Along with the Bearpaw Mountains and Eagle Buttes, they form a northeast-trending belt within the Montana Alkalic Province, and were all emplaced between 54 and 50 Ma. In the Highwoods an older suite of quartz-normative latites is overlain and intruded by a younger suite composed mostly of mafic phonolite flows and dikes, minette and trachyte dikes, and shonkinite-mafic syenite stocks. This trip examines a variety of dikes, sills, and stocks composed of these unusual rock types.

Topics: Metamorphic rocks, Igneous rocks, Sedimentary rocks
Geographic Location: North-Central Montana
Geologic Province: Montana Plains

1 2 Next»