Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A common, straight cephalopod from the Arkona Formation. They are pyritic internal molds with suture lines showing the chambers. They are most common from the Pyrite Zone. The average length in the photo is 20mm.

Photo title: Straight Cephalopod

Taxa present: Bactrites arkonensis

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A straight cephalopod found in the upper section of the Arkona Formation. More common in the formation as one gets nearer to the Tile Yard in Thedford. This specimen is 75mm in length and 34mm in diameter.

Photo title: Straight Cephalopod

Taxa present: Dolorthoceras exile

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A common, coiled ammonite that occurs in the Arkona Formation. They are pyritic internal molds showing their suture lines. These are large specimens for the Arkona shale with the larger one measuring 17mm and the smaller 15mm in diameter.

Photo title: Ammonite

Taxa present: Tornoceras (T.) arkonense

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A somewhat common clam in certain horizons but rarer throughout the rest of the formation. They are often attached to hard crinoidal pieces. The large specimen is 30mm X 27mm. The smaller measures 25mm X 23mm.

Photo title: Pelecypod

Taxa present: Leiopteria ausablensis

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Two views of a pyritized clam from the Arkona Formation’s pyrite zone. They are approximately 13mm long and 9mm wide.

Photo title: Pelecypod

Taxa present: Nucula lirata

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This solitary coral is common in the formation. These two specimens are choice examples. The coral on the left is 38mm in diameter. The one on the right is 68mm long and 36mm in diameter.

Photo title: Horn Coral

Taxa present: Cystiphylloides americanum

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This tabulate coral is encrusting the underside of a Favosites colony. This coral is rare in the formation. The Favosites measures 68mm X 57mm. Each coral chain link is approximately 10mm in length.

Photo title: Coral on Coral

Taxa present: Aulopora tubaeformis, Favosites placenta

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Finding whole colonies of this bryozoan is a rare occurrence in the Arkona Formation. This branching specimen required some reassembly after cleaning. The colony measures 73mm tall by 57mm wide.

Photo title: Bryozoan

Taxa present: Leptotrypella quadrangularis

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: The Reptaria encrusted this cephalopod after it had died. The cephalopod is 47mm in length and is 23mm in diameter at it’s widest.

Photo title: Bryozoan encrusting a Cephalopod

Taxa present: Reptaria stolonifera, Dolorthoceras exile

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A close-up view of The Bryozoan Reptaria.

Photo title: Encrusting Bryozoan

Taxa present: Reptaria stolonifera

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A common brachiopod from the Hungry Hollow member of the Widder fm. The outer surface resembles a thumbnail. Top Row: pedicle valve views. Middle Row: Brachial view of a complete specimen. Bottom Row Left: Pedicle valve showing muscle scars. Bottom Row Right: Brachial valve showing muscle scars. These specimens range from 17-21mm wide and 5-7mm in height.

Photo title: Brachiopod

Taxa present: Pholidostrophia nacrea

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: This very inflated prone trilobite measures 32mm in length and 20mm wide. This choice specimen from the upper Widder units shows very little compression. Nearly all trilobites are preserved with various degrees of compression.

Photo title: Trilobite

Taxa present: Eldredgeops rana rana

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: A second view of this very inflated prone trilobite which measures 32mm in length and 20mm wide. This choice specimen from the upper Widder units shows very little compression. Nearly all trilobites are preserved with various degrees of compression.

Photo title: Trilobite

Taxa present: Eldredgeops rana rana

View full record

Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Quality single specimen trilobites’, found enrolled or prone, are rare for the formation. The Hungry Hollow member was a high energy environment which made preservation of complete specimens quite rare. Finding more than one trilobite genus on a slab is even rarer. From left to right the specimens measure 23.5mm X 18mm, 30mm X 18mm, and 32mm X 23mm. The second Basidechenella on the right of the Eldredgeops is upside down.

Photo title: Trilobite Group

Taxa present: Eldredgeops rana rana, Basidechenella arkonensis

View full record

Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The 1958 checklist by Stumm & Wright lists 9 different Dolatocrinus species. This genus exhibits a great deal of plate variation for any given species. With this in mind, Kesling & Mintz (1963) synonymies nine species into three; D. bulbaceous, D. liratus, and D. tridactylus are the species from the Hungry Hollow member listed in the order of their abundance in the formation; however, all are very rare. The three specimens of D. liratus in the photo show top, side, and bottom views. They all measure 17mm in diameter and average 15mm in height.

Photo title: Crinoid Calyx

Taxa present: Dolatocrinus liratus

View full record

Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Like the genus Dolatocrinus, Megistocrinus has great plate ornamentation variability which can make classification to the species level difficult. There are probably only 2 or 3 species in the Hungry Hollow member. Loose plates of Megistocrinus are common in the formation and even partial specimens should be collected due to the rarity of whole calyxes. This specimen is 29mm in diameter and 19mm high. This photo is of the tegmen(top)view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus depressus

View full record

Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Like the genus Dolatocrinus, Megistocrinus has great plate ornamentation variability which can make classification to the species level difficult. There are probably only 2 or 3 species in the Hungry Hollow member. Loose plates of Megistocrinus are common in the formation and even partial specimens should be collected due to the rarity of whole calyxes. This specimen is 29mm in diameter and 19mm high. This photo is of the side view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus depressus

View full record

Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Like the genus Dolatocrinus, Megistocrinus has great plate ornamentation variability which can make classification to the species level difficult. There are probably only 2 or 3 species in the Hungry Hollow member. Loose plates of Megistocrinus are common in the formation and even partial specimens should be collected due to the rarity of whole calyxes. This specimen is 29mm in diameter and 19mm high. This photo is of the bottom view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus depressus

View full record

Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Like the genus Dolatocrinus, Megistocrinus has great plate ornamentation variability which can make classification to the species level difficult. There are probably only 2 or 3 species in the Hungry Hollow member. Loose plates of Megistocrinus are common in the formation and even partial specimens should be collected due to the rarity of whole calyxes. An inflated nearly perfect specimen of M. rugosus that in itself, is rare for the Hungry Hollow member. This specimen is 30mm in diameter and 24mm high. This photo shows the tegmen top) view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus rugosus

View full record

Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Like the genus Dolatocrinus, Megistocrinus has great plate ornamentation variability which can make classification to the species level difficult. There are probably only 2 or 3 species in the Hungry Hollow member. Loose plates of Megistocrinus are common in the formation and even partial specimens should be collected due to the rarity of whole calyxes. An inflated nearly perfect specimen of M. rugosus that in itself, is rare for the Hungry Hollow member. This specimen is 30mm in diameter and 24mm high. This photo shows the side view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus rugosus

View full record