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    • Have You Seen This Giant 90 Foot Deep Sinkhole In Alpena Michigan
    • Sinkhole - Michigan Natural Features Inventory
    • Maps - Alpena Chamber of Commerce
    • Northern Michigan From Above: Alpena County Sinkholes – 9&10 News
    • USGS Topo Map Vector Data (Vector) 690 Alpena, Michigan 20200708 for 7. ...

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  2. www.visitalpena.com › adventures › sinkholesSinkholes - Visit Alpena

    You can find plants growing in the bottom of some sinkholes that are not found anywhere else in the local region. Created when subsurface layers of anhydrite and gypsum dissolve, sinkholes dot the landscape in and around Alpena with the country’s highest concentration of these geologic wonders.

  3. www.visitalpena.com › places › sinkholes-at-rockportSinkholes at Rockport State Recreation Area - Visit Alpena

    There are 13 sinkholes located at Rockport as a result of the Karst topography of the area. One of the sinkholes is over 100 feet deep and filled with water from an underground aquifer. Search for Devonian Era fossils around the sinkholes or in the abandoned 300-acre limestone quarry located on the property.

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  5. mnfi.anr.msu.edu › description › 10707Sinkhole - Michigan Natural Features Inventory

    • Graminoids
    • Forbs
    • Ferns
    • Shrubs
    • Trees
    big bluestem (Andropogon gerardii)
    blue-joint (Calamagrostis canadensis)
    sedges (Carex aurea, C. eburnea, C. flava, C. pensylvanica, C. viridula, and others)
    twig-rush (Cladium mariscoides)

    See full list on mnfi.anr.msu.edu

    wild sarsaparilla (Aralia nudicaulis)
    jack-in-the-pulpit (Arisaema triphyllum)
    wormwood (Artemisia campestris)
    harebell (Campanula rotundifolia)

    See full list on mnfi.anr.msu.edu

    lady fern (Athyrium filix-femina)
    rattlesnake fern (Botrypus virginianus)
    bulblet fern (Cystopteris bulbifera)
    oak fern (Gymnocarpium dryopteris)

    See full list on mnfi.anr.msu.edu

    bearberry (Arctostaphylos uva-ursi)
    sweetfern (Comptonia peregrina)
    bunchberry (Cornus canadensis)
    gray dogwood (Cornus foemina)

    See full list on mnfi.anr.msu.edu

    balsam fir (Abies balsamea)
    sugar maple (Acer saccharum)
    paper birch (Betula papyrifera)
    American beech (Fagus grandifolia)

    See full list on mnfi.anr.msu.edu

  6. www.michigantrailmaps.com › sinkholes-pathwaySinkholes Pathway - Michigan Trail Maps

    view map. Michigan’s karst region is spread across Presque Isle, Alpena and Montmorency counties in the northwest corner of the Lower Peninsula and the heart of it is the Sinkhole Area, a non-motorized, 2,600-acre slice of the Mackinaw State Forest between Onaway and Atlanta.

  7. www.thealpenanews.com › news › local-newsAlpena-area sinkhole offers clues to planet’s early history

    Sep 13, 2021 · Samples of a microbial mat at the bottom of a 75-foot-deep sinkhole off the north shore of Middle Island, near Rockport State Recreation Area in the waters of Thunder Bay National Marine...

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