Geologic History
ALL of geologic time before 542 million years ago
What is the PreCambrian?
The period of first abundant evidence of life.
What is the Cambrian Period?
Long and wide-spread climate related erosion event in recent Geologic Time
What was the last Ice Age?
Length of time represented by the Geologic Time scale.
What is 4.6 billion years?
Uniformitarianism refers to an assumption of uniform processes happening today and in the past. It is the foundation principle of this type of rock dating.
what is Relative Dating?
Eon of the oldest NY bedrock formation
What is the late Proterozoic Eon?
The divisions of Eras is based on these
What are mass extinctions?
This NYS Landscape began to uplift late in the Era of dinosaurs
What are the Adirondack Mountains?
We believe the Sun and planets formed from this.
What a Nebular cloud? Space Dust
This principle of stratigraphy allows that undisturbed rock strata beneath others are older.
What is Superposition?
According to the NY rock record, the youngest bedrock in NYS formed in this Period
What is the Jurassic?
The name of the period in which the local bedrock of Watertown NY formed .
What is the Ordovician Period?
After the Salinic Orogeny, this process formed the rock underlying what is now Western NY
What is the deposition of salt and gypsum?
This is often called the Era of Dinosaurs?
What is the Mesozoic ?
This Radioisotope is most commonly used to date granitic rocks?
What is K-40 ?
The Era when molecular Oxygen begins to enter the atmosphere
What is the PaleoProterozoic?
Rock of Late Cretaceous age could contain the first evidence of this flora.
What is grass?
Extinction of the ammonoids is assumed to have been caused by this event
What is an object from space struck Earth?
What is the volcanism that formed the Deccan Traps?
Rock age containing fossils of earliest fish with jaws.
What is the Silurian Period or about 430 myo?
The reason why C-14 rarely used to date rock?
What is it has too short a half-life?
or it it not common in rock?
We conclude from this evidence, found in NeoArchean rock, that molecular Oxygen became part of the oceans
What is iron-oxide or banded iron formations?
Index Ammonoid species found in NY rock
What is Agoniatites?
Soidification, uplift, erosion, subsidence, deposition;
These processes create this evidence of missing evidence
What is a non-conformity?
Special fossils representing organisms that are found in rock world-wide of just one specific formation time frame.
What are index fossils?
A bone sample is assumed to be about 60,000 years old. If this is confirmed with RadioCarbon dating, the data would show this many half-lives have gone by.
What is more than 10 or almost 11 ?