IDEAS Field Trip - Geology of Southeastern New York
October 28-29, 2006

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ancient_life_group.JPG
NYS Museum exhibit on Ancient Life in New York State
stromatolite_shore.JPG
Reconstruction of Late Cambrian shallow carbonate shoreline with stromatolites (bacterial mud mounds).
climachtichnites.JPG
Climachtichnites is a trace fossil made by a large animal with fleshy walking appendages. These trackways are only found in Late Cambrian shoreline sandstones. The identity of the trackmaker remains a mystery.
trackways.JPG
Cambrian Climachtichnites trackways across a rippled sandflat, Potsdam Sandstone.
orthocone_recon.JPG
Reconstruction of Ordovician pelagic life, including a large orthoconic nautiloid, seaweed, graptolites, and gastropods.
Eurypteris.JPG
Fossil eurypterid (sea scorpion) and illustration from James Hall's Paleontology of New York.
state_fossil_NY.JPG
Eurypteris remipes - the state fossil of New York! Late Silurian Bertie Dolostone.
eurypterid_recon.JPG
Reconstruction of a Silurian sea scorpion or eurypterid.
eurypterid_recon2.JPG
Reconstruction of a large eurypterid from the Late Silurian of New York.
pentamerus.JPG
Mass accumulation of large pentamerid brachiopods from the Silurian of New York.
cherry_valley_ammonoids.JPG
Large slab of the Middle Devonian Cherry Valley limestone with abundant nautiloid and ammonoid cephalopods.
cephalopods.JPG
Closeup of Cherry Valley limestone cephalopods showing coiled ammonoids and orthoconic and cyrtoconic nautiloids.
ammonoids.JPG
Ammonoids from the Middle Devonian Cherry Valley limestone.
CV_nautiloid.JPG
Large orthoconic (straight-shelled) nautiloid in the Cherry Valley limestone.
Hydnoceros.JPG
Mass accumulation of fossil glass sponges (Hydnoceros) from the Middle Devonian of New York.
hydnoceros2.JPG
Closeup of Hydnoceros sponges showing typical basket-like framework of glass sponges.
hydnoceros3.JPG
Hydnoceros - Devonian basket sponge.
Devonian_seastars.JPG
Seastars from the Middle Devonian of New York.
Seastars.JPG
Seastars preserved in Devonian Hamilton Group rocks.
Devonaster.JPG
Closeup of Devonaster - a seastar from the Middle Devonian.
gilboa_stump.JPG
Fossil tree stump from an Upper Devonian forest found preserved in the Catskill Mountains near Gilboa, New York.
Devonian_plants.JPG
Devonian fossil plants, including Archaeopteris, the oldest seed-bearing plant known.
Archaeopteris.JPG
Close up of Archaeopteris, a Late Devonian seed-bearing plant.
trackway.JPG
Dinosaur trackways (a species known as "Grallator") from the Upper Triassic Stockton Formation, Rockland Co., NY.
Coelophysis.JPG
Cast of articulated Coelophysis skeleton - the purported trackmaker responsible for the small three-toed trackways (Grallator) found in Upper Triassic rocks in the Newark Basin.
Coelophysis_recon.JPG
Reconstruction of Coelophysis - a Late Triassic carnivorous dinosaur.
Coelophysis_head.JPG
Closeup of the head of Coelophysis.
mastodont.JPG
The Cohoes Mastodont. Mastodonts were forest-dwelling elephants that lived in North America until the end of the last ice age, about 10,000 years ago.
Mastodont2.JPG
The Cohoes Mastodont.
JBT_underground_stream.JPG
Underground stream outlet along escarpment at John Boyd Thatcher State Park. The Helderberg limestones are riddled with caverns and underground streams - an example of karst topography typical of a region underlain by carbonate bedrock.