Class Notes (837,255)
Canada (510,192)
Biology (2,156)
BIO211H5 (55)
Lecture

Sept 21.doc
Premium

3 Pages
69 Views
Unlock Document

Department
Biology
Course
BIO211H5
Professor
Jessica Hawthorn
Semester
Fall

Description
BIO211 Sept 21st Fossilization & Taphonomy Fossils - remains or signs of ancient organisms - found in sedimentary strata o few exceptions where fossils can survive very low-grade metamorphism - thousands to millions of years old - most fossils are hard parts of organisms o may be completely replaced by minerals - soft tissue can be preserved in exceptional environments - basic requirements: o oxygen-poor environment o low-energy setting o rapid burial in fine-grained sediment - permineralization: infilling of tissue by inorganic materials - impressions: 2D preservation of outlines and surfaces - carbonization: concentrated residue of remaining carbon - molds: 3D negative imprints - Steinkerns: natural casts - ichnofossils (trace fossils): o provide behavioural information about extinct animals o tracks/trackways, trails, burrows, nests o coprolites, regurgitates - amber: fossilized tree resin - fossils provide incomplete, biased view of past life o not all organisms are preserved o not all skeletal material is preserved  scavenging/predation  transport and abrasion  post-burial alteration of rock - not all fossils are exposed at the surface - understanding geology and taphonomy can help recognize and overcome biases What is Taphonomy? - the study of all factors that affect a fossil from the time of death of the organism until its discovery 1. necrolysis: 2. biostratinomy: 3. diagenesis: Organisms not Preserved - factors affecting preservation: o scavenging o depth o salinity o pH o oxygenation o climate (temperature, moisture) o depositional regime – materials and rates o wave or current action  transport, abrasion - the impact of each of these factors is in part determined by the length of time between death and burial Location Location Location - the appropriate conditions must be present for preservation to occur o burial o fine sediments o no or slow decomposition o
More Less

Related notes for BIO211H5

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit