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Pictured Rocks National Lakeshore is among the most popular parks in Michigan, yet prior to this study, it was the only National Park that lacked a detailed surficial geology map characterizing the distribution of sediments and landforms. Additionally, much of the landscape remained unexplored. These factors prevented thorough interpretations of landscape development and evolution. This research aims to map and further explore the relationship of glacial sediments and landforms throughout Pictured Rocks to refine and expand the current understanding of glacial events that shaped this landscape. A new, detailed (1:24,000-scale) surficial geology map of the ten 7.5-minute quadrangles that contain Pictured Rocks was developed as part of this study. Sediments were classified below the surface soil horizons throughout the mapped area. Additionally, the horizontal-to-vertical spectral ratio (HVSR) passive seismic method was employed throughout the greater Pictured Rocks region to estimate glacial sediment thickness and subsurface bedrock topography. Optically Stimulated Luminescence (OSL) dating was performed on two samples chosen from specific landforms of interest to help develop a chronological framework for this region. However, insufficient sediment bleaching yielded ambiguous OSL results. Field investigations were combined with several additional, preexisting datasets to produce the final surficial geology map of the Pictured Rocks area. Mapping reveals notable regional differences in sediment and landform distribution. The western portion of Pictured Rocks consists of subtle subglacial and ice-marginal landforms that appear to have been segmented by subsequent proglacial outwash deposition. These features are largely underlain by undifferentiated thin sediment accumulations above shallow bedrock. The east displays thicker accumulations of glaciofluvial sediments consisting of various outwash units. Collectively, the surficial geology in the west and east areas of Pictured Rocks create a landform suite that is characteristic of actively receding glaciers in temperate climate conditions. Several buried bedrock valleys were also discovered and/or confirmed throughout the study area, which are interpreted as southern extensions of the glacial tunnel valley network carved into the floor of the Lake Superior basin north of Pictured Rocks. Sediments deposited during the final stages of deglaciation buried the southernmost segments of many of these valleys. The surficial geology map and subsurface findings serve as primary resources to guide landform interpretations throughout the study area. These interpretations are integrated into a newly-proposed reconstruction of glacial events that occurred from the late Pleistocene through final deglaciation of the Pictured Rocks region during the early Holocene. This research has revealed greater detail of sediment-landform assemblages and the subsurface bedrock topography, which has led to a more comprehensive analysis of the glacial processes that shaped the Pictured Rocks landscape.
Michigan's Pictured Rocks National Lakeshore is the jewel of Lake Superior's South Shore. Every year, over 70,000 people take the cruise boats to view the towering, mineral-stained sandstone cliffs that give the park its name. Pictured Rocks is beginning to draw international tourism, and this photo book easily fits into a suitcase and is inexpensive to mail.
"To discover astonishing rocks and landforms in the Beaver State, all that is required is a good map, a sense of adventure, and Oregon Rocks, a guide to 60 of the most compelling geologic sites in the state. The well-chosen destinations span the state's geologic history from the Triassic marble at Oregon Caves to the 240-year-old lava dome on Mt. Hood. With more active volcanoes than any other state in the Lower Forty-Eight, Oregon boasts towering behemoths, steaming fumaroles, and eroding cinder cones. Geologist Marli Miller will guide you through the ash and lava from recent eruptions to find evidence of older ones, including a supervolcano possibly produced by the Yellowstone hot spot before it tracked east, and lava that flowed all the way to the coast from eruptions near the Oregon-Idaho border. Although residents of eastern and western Oregon may not admit they have anything in common, the barnacled sea stacks near Cannon Beach and Tillamook are composed of the exact same rock as stacked lava flows on the Columbia Plateau. With beautiful photographs and informative figures and maps, this guidebook will unite Oregonians in their pursuit of outdoor exploration, be it rock hounding, peak bagging, beachcombing, or contemplating their place in the long history of the Earth"--
A study peeling back the layers of biblical geology.