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Calvert Cliffs Pages:
All About the Calvert Cliffs
Megalodon Shark Fossils found at Clavert Cliffs
Shark Fossils found at Clavert Cliffs
Other Vertebrate Fossils found at Clavert Cliffs
Invertebrate Fossils found at Clavert Cliffs
Chesapeake Bay Tide / Wind / Weather Data
Printable I.D. Sheets for Calvert Cliffs
Trip Reports for Calvert Cliffs
Calvert Cliffs Coffee Club Cups





Calvert Cliffs Collecting Location Page:
Calvert CLiffs, MD



All fossils that can be found at the Calvert Cliffs of MD



Calvert Cliffs Coffee Club Coffee Cups!
A unique gift for the fossil hunter.



Printable Identification Fossil Sheets for Vertebrates and Invertebrates of the Calvert Cliffs





Invertebrate Miocene Fossils Found in the Calvert & Choptank formations at the Calvert Cliffs of Maryland

The bottom of the page includes fossil plants: Lignite and seeds found at the Cliffs

(Fossil Identification for Oysters, Clams, Scallops, Sand Dollars, Crustaceans, Coral, Plants, etc...)


Invertebrates
(Crustaceans, shells, echinoderms, coral, ...)


Crustaceans
Crustacea Class

Decapoda Order
Crabs
Crab Claw Fragments
Fossil Crab Claw Fragments
Fossil Crab claw tips

Crab claw fragments are fairly common, but small and often overlooked for shark teeth. They are usually hollow and have a bluish or tan color.

For additional images of crab claw fragments, go to the Aurora Invertebrate page.

Formation:
  • Choptank
    Age:
  • Middle Miocene ~ 15-12 m.y.
    Location:
  • Matoaka Cottages, Calvert Co., MD

  • Bivalves

    Chesapecten Nefrens
    Bivalve
    Extinct Scallop
    fossil scallop chesepecten neferens shell
    These ones were found whole laying in a fresh fall.

    Formation:
  • Choptank
    Age:
  • Middle Miocene ~ 15-12 m.y.
    Location:
  • Calvert Cliffs, Calvert Co., MD
    Date:
  • June, 2007 Trip
  • fossil scallop shell - chesapecten
    This shell has a tiny one cemented to it. Kind of neat!

    Formation:
  • Choptank
    Age:
  • Middle Miocene ~ 15-12 m.y.
    Location:
  • Calvert Cliffs, Calvert Co., MD
    Size:
  • ~ 4 1/2" (113mm) wide
    Date:
  • June, 2007 Trip
  • fossil casts and molds of the scallop shell chesapecten from the calvert cliffs of maryland
    In some places around the Choptank and St. Marys formation, sections of rock contain 100's of casts and molds of the scallop shells.
    This is a small sample from one of those chunks.

    Formation:
  • ?Choptank
    Age:
  • Middle Miocene ~ 15-12 m.y.
    Location:
  • Calvert Cliffs, Calvert Co., MD
  • Glycymeris sp.
    Bivalve
    Identification based on Glaser (1979, p22-23)
    These fragile bivalves, often with both halves still attached, are abundant in certain zones along the cliffs.

    Formation:
  • Calvert
    Age:
  • Early - Middle Miocene ~ 18-15 m.y.
    Location:
  • Randle Cliffs, Calvert Co., MD
  • Isognomon maxillata (Deshayes)

    Oyster- Common names: Giant Tree Oyster & Giant Purse Oyster
    Identification based on Glaser (1979, p22-23)
    These large oyster shells are the index fossil for the Eastover Formation. They are also found in the Calvert and Choptank formations. In certain spots along the Choptank, they literally cover the entire ground, and you have to walk on them.
    These shells are usually white and flaky. Due to their fragile nature, they are difficult to find with both halves attached. This oyster genera is characterized by the large grooved ligamental area (place where the two shell halves attach).

    Layer of isognomon fossils, tree oysters. This layer is chalk full of them. Calvert cliffs
    Layer of fossil bivalves, shells. This is a layer in the choptank formation at the calvert cliffs of maryland.
    These two images show a layer of the large fossil tree oyster shells. This is a layer in the Choptank formation. Many of the fossil shells are broken.
    This is a view of a front and back of a single shell from a specimen.
    This is how they are typically found.
    Notice the large groves in the ligmental area, the part that attaches to the other side of the shell

    Formation:
  • Choptank
    Age:
  • Early - Middle Miocene ~ 18-15 m.y.
    Size:~4" They are usually between 4-6" (10-15 cm) in size Location:
  • Near Kenwood Beach, Calvert Co., MD
  • fossil tree oyster shell from the calvert formation
    This is a well preserved specimen with both halves still attached. It was found by Bobby Nuckols in VA. He was nice enough to let me use an image of it for this site.

    Formation:
  • Chalvert
    Age:
  • Early - Middle Miocene ~ 18-15 m.y.
    Location:
  • Near Tappahannock, VA


  • Gastropods

    Ecphora sp.
    Extinct Gastropod - Murex Shell

    Ecphora Gardnerae is the Maryland State fossil. Their shells are intricately shaped. They are very fragile, and are often found broken.

    maryland state fossil - ecphora - the murex shell from calvert cliffs

    Formation:
  • Choptank
    Age:
  • Middle Miocene ~ 15-12 m.y.
    Location:
  • Calvert Cliffs, Calvert Co., MD
  • fossil murex shell - ecphora - the maryland state fossil
    This ecphora fossil has a nice bright orange color.

    Formation:
  • Choptank
    Age:
  • Middle Miocene ~ 15-12 m.y.
    Location:
  • Calvert Cliffs, Calvert Co., MD

  • Echinoderms


    Sand Dollar fragments

    If you collect anywhere along the Choptank, you are bound to encounter fragments like these. They are sand dollar fragments. Occasionally you can still make out the patterns on them.
    Complete ones are next to impossible to find.

    Formation:
  • Choptank
    Age:
  • Early - Middle Miocene ~ 15-12 m.y.
    Location:
  • Near Matoaka Cottages, Calvert Co., MD

  • Coral

    Astrhelid sp.
    Coral
    Identification based on Glaser (1979, p57).

    Formation:
  • Choptank
    Age:
  • Early - Middle Miocene ~ 15-12 m.y.
    Location:
  • Matoaka Cottages, Calvert Co., MD

  • Barnacles

    Balanus sp.
    Barnacle
    Identification based on Glaser (1979, p35)

    Formation:
  • Choptank
    Age:
  • Early - Middle Miocene ~ 15-12 m.y.
    Location:
  • Matoaka Cottages, Calvert Co., MD


  • Plants - Lignite


    Xyloid Lignite

    Lignite is a very low grade form of coal that retains it's original wood structure. The type of lignite present at the Calvert Cliffs area is called Xyloid Lignite, or fossil wood. This type of lignite is not yet compacted into the higher grade lignite. It hasn't been buried deep enough or long enough. Xyloid Lignite is usually geologically young, and comes from Tertiery sediments, such as the lignite found in the Miocene Chesapeake Group - Calvert, Choptank, and St. Mary's formations.

    At the Calvert Cliffs area, most of the lignite is from Cypress trees that grew in cypress swamps along the ancient shores.
    The large amounts of Cypress trees indicate a much warmer climate along the Chesapeake Bay in the past.

    If one looks at the cliffs and chunks of cliffs, you will see small dark objects which are mushy to the touch. This is lignite.

    Fossil lignite from the Calvert Cliffs. This is a section of cypress tree about 7 foot up in the cliffs
    This is fossil lignite about 7 feet up in the calvert cliffs. This large chunk is from a cypress tree.

    Formation:
  • Choptank
    Age:
  • Middle Miocene ~ 15-12 m.y.
    Location:
  • Calvert Cliffs, Calvert Co., MD
  • Fossil lignite from the Calvert Cliffs. This is a section of cypress tree eroding out of a cliff chunk that has fallen
    Fossil lignite from the Calvert Cliffs. This is a section of cypress tree eroding out of a cliff chunk in the surf. The wood is in the clay block, and eroding out at various places. It also looks like a cypress piece.

    Formation:
  • Calvert
    Age:
  • Middle Miocene ~ 15-12 m.y.
    Location:
  • Calvert Cliffs, Calvert Co., MD
  • Xyloid Lignite Seeds
    In one small section of the Chesapeake group, fossil seeds are found throughout a section of cliffs. I'm not sure what these are. They look like little walnuts. I wouldn't rule out cypress seeds, but really have no idea of the plant they came from.
    Fossil lignite seeds from the the Calvert Cliffs area
    A small section of cliffs has these fossil seeds in them. This is the center of the seed. The outside shells are a little bigger. The lignite is very brittle and quickly flakes apart.

    Formation:
  • ??
    Age:
  • ??Miocene
    Location:
  • Near Calvert Cliffs, Calvert Co., MD




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