Deerfield Basin Essay

Better Essays
Introduction
On September 12, and October 3, 2016, we stopped at 6 locations north of Northampton in the Deerfield Basin of the Connecticut River Valley (Figure 1). The purpose of these stops is to examine rocks, interpret depositional environments for each rock formation, and discuss the geologic history of the Deerfield Basin based on observations and interpretations. Early Mesozoic lithospheric extension led to the development of a long sequence of rift basins. The Deerfield basin is the erosional remnant of one of these rifts exposed in North America after Pangaea separated during the Carnian (Olsen et al., 1992). Today, the valley formations include Pre-Triassic basement, Late-Triassic Sugarloaf Arkose, Early-Jurassic Fall River Beds, Jurassic Deerfield Basalt, Jurassic Turner Falls Sandstone, and Jurassic Mt. Toby Conglomerate.
Observations
Stop 1, located on Rt. 2 West at the Longview Gift Shop, the Gile Mountain Formation is exposed alongside the road. The Devonian Gile Mountain Formation is a dark grey phyllite, with abundant
…show more content…
The Sugarloaf Arkose makes up the basal unit and reveals a fluvial and alluvial arkose environmental deposition. The dominant sandstone grain size is evidence of a fluvial depositional environment at Stop 2. The Late-Triassic age alluvial and fluvial arkose of the Deerfield Basin makes up the main strata sequence. Stop 3 reveals the Deerfield Basalt followed by lava flow in the strata column. The transition between Fall River Beds and Sugarloaf Arkose is at the Triassic and Jurassic boundary (Figure 5). The Fall River Beds at stop 4 and Sugarloaf Arkose show a sequence of grey and red lacustrine sandstone, siltstone, and pebbly sandstone. The lower portion of this sequence is interbedded with basalt (Olsen et al.,

Related Documents

  • Decent Essays

    Mt. Isa Mine

    • 836 Words
    • 4 Pages

    The host rock of this deposit consists of pyritic shale, carbonaceous shale, dolomitic siltstone, carbonate, granite, ironstone and metasedimentary cover rocks (Hutton et al. 2012). Deposit genesis The ore deposit genesis is considered to have occurred in the Urquhart Shale, deep water and black shale environment, shallow water and hypersaline environment (Forrestal, 1990). In the Urquhart Shale, hydrothermal alteration had taken place in which the selected beds were changed to pyrite, galena and sphalerite.…

    • 836 Words
    • 4 Pages
    Decent Essays
  • Decent Essays

    The Kaapvaal Craton

    • 995 Words
    • 4 Pages

    The Kaapvaal Craton’s granitoid rocks age between 3600Ma and 2500Ma (Anhaeusser, 2006). A number of supergroups overly the Kaapvaal Craton which range from oldest to youngest and include the Pongola, Witwaterstrand, Ventersdorp, and Traansvaal Supergroup (Anhaeusser, 2006). According to Sumner and Beukes (2006), the deposition of banded iron formations occur across the Kaapvaal Craton. The Kaapvaal Craton forms the basement of the Transvaal Supergroup. Filled with siliciclastic sediments and…

    • 995 Words
    • 4 Pages
    Decent Essays
  • Decent Essays

    Kotenai Formation

    • 1380 Words
    • 6 Pages

    The Morrison Formation of the Jurassic period overlaid this Formation in most mapping areas. Upper Dinwoody Formation consists of brownish to orange rocks when exposed, and the new rocks are in either gray color or sparkly crystals, indicating the calcium carbonate. Dinwoody Formation preserves fossils such as Claraia that dates back to the early Triassic period. Claraia fossil is a shelly fossil that leaves thin, rounded and convex-shaped casts within the planar beds of limestone. Upper Dinwoody rocks are typically resistant and form on high ridges, while Lower Dinwoody is recessive and found in the…

    • 1380 Words
    • 6 Pages
    Decent Essays
  • Decent Essays

    Great Valley Sequence

    • 717 Words
    • 3 Pages

    Field Trip Report: Great Valley Sequence and Coast Range Ophiolite The Moreno Formation in the Great Valley Sequence (GVS) is consisting of interbedded sandstones and organic-rich black shales, which were deposited during Upper Cretaceous (74-80 Ma) in near shore and shallow marine environment according to the fossils found. The sandstone in this outcrop is medium-sorted, angular to sub-angular arkosic arenite, with minerals such as quartz, plagioclase, muscovite and altered biotite. 1/4 of the muscovite was dated as 90 Ma old, matching the time of Cathedral Peak Intrusion. The provenance of the sandstone is probably granites. Round concretions on sandstones indicate calcite dissolution.…

    • 717 Words
    • 3 Pages
    Decent Essays
  • Decent Essays

    The DeGray Dam Spillway east and west walls have similar lithofacies, and are approximately 100 m apart. The authors examined 8 lithofacies types in their study area: massive sandstone, sandstone with floating mudstone clasts, pebbly sandstone, contorted sandstone, contorted shale, mudstone/shale with floating clasts, laminated and rippled sandstone and siltstone, and laminated shale. These lithofacies were interpreted based on depositional processes. At DeGray Spillway, 794 units were measured and 189 units were measured at Kiamichi Mountain. A composite sedimentological log was created using these measurements.…

    • 1460 Words
    • 6 Pages
    Decent Essays
  • Decent Essays

    Granite Formation

    • 1344 Words
    • 6 Pages

    2014), which in this case will have been provided from the magma that formed the granite as it was extruded into, and cooled, in the surrounding area. The next two layers are a sandstone layer spanning from west to east and a limestone layer sitting on top of it. Both layers contain Devonian trilobite fossils. The Devonian period lasted from 416ma- 358ma (Bagley 2014), which gives us a clue into how old this strata is. Sandstone is a detrial sedimentary rock composed of particles of weathered or eroded rocks and minerals ranging in size from 1/16-2mm while limestone is composed mostly of calcium…

    • 1344 Words
    • 6 Pages
    Decent Essays
  • Decent Essays

    Loess is wind-blown silt and fine sand and clay. Loess forms a “blanket” that covers millions of miles of underlying bedrock. Just within Mesa Verde National Park, there is a covered area of seven percent of the map area (Carrara, 2012, p.15). Colluvium is the third major surficial geological unit within the Mesa Verde area. Colluvium is considered to be “any loose, heterogeneous, and incoherent mass of soil material or rock fragments that were transported and deposited by gravity by slow mass-movement processes, chiefly creep” (Carrara, 2012, p.15).…

    • 1088 Words
    • 5 Pages
    Decent Essays
  • Decent Essays

    This makes the sandstone a mature sandstone. The sandstone is probably well rounded, well sorted, and well cemented if it is mostly made up of quartz and feldspar. Analysis of cross bedding and other sedimentary directional indicators imply that the formation was derived from a terrane consisting of igneous, high-grade metamorphic, and sedimentary rocks (Morey 1967). Morey’s study agress with what Ojakangas and Matsch put into the Minnesota’s geology book. Both of these studies state that the sandstone came from the weathering and erosion of the igneous and metamorphic rocks.…

    • 1579 Words
    • 7 Pages
    Decent Essays
  • Decent Essays

    It is interpreted to extend southwards into the United States below the Williston basin and extends northeast into Nunavut and northern Quebec wrapping around the Archean Superior craton (Ansdell, 2005). The THO is the end result of the closure of the Manikewan Ocean (Stauffer, 1984) which resulted in the formation juvenile crust which was eventually accreted onto the Archean Superior and Hearne cratons as well as a number of smaller cratons including the Sask Craton (Lewry et al.,1994). The THO preserves a relatively complete tectonostratigraphic evolutionary history including evidence for rifting (ca. 2450-1950 Ma), the formation of oceanic crust (ca. 2000-1800 Ma), and sedimentary assemblages deposited along continental margins and younger (1880-1830 Ma) collisional and foredeep basins (Ansdell, 2005).…

    • 2081 Words
    • 9 Pages
    Decent Essays
  • Decent Essays

    Patrick Johnson Engr 597 Tectonics Dr. Gifford 10/14/2016 Formation of the Rocky Mountains Abstract • How did they form? • Sevier orogeny • Laramide orogeny • prevailing theory (flat slab subduction) 1. Very low angle subducting slab 2. rubbing against underside of North American plate 3. first proposed by william dickinson (1978) 4. another good paper Peter Bird (1988) • Alternative theories 1. Craig jones - suction model 2. (maxson, Tikoff 1996) - Hit and run collision model "I 'll come back to it" Introduction Within the North American cordillera there lies an expansive region of mountain ranges, basins, and plateaus, stretching from Mexico through America and Canada all the way to Alaska.…

    • 929 Words
    • 4 Pages
    Decent Essays