Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Earth Systems 3209 Unit: 3 Earth’s Materials Reference: Chapters 2, 3, 6, 7; Appendix A & B

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Biochemical Sedimentary Rocks Unit 3: Topic 4.6 Focus on...  Identifying the processes that form biochemical sedimentary rocks.  Identifying different biochemical sedimentary rocks and the environment in which they form.

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Chemical Sedimentary Rocks (Biochemical) vBiochemical  Sedimentary rock created when organisms use materials dissolved in air or water to build their tissue.  Examples include: Coquina Chaulk Chert Limestone (Coral) Coal

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Examples of chemical sedimentary rocks include: 1) Coquina  Organic rock of biochemical origin.  forms from the build-up, compaction, and cementation of the shells of dead organisms. Chemical Sedimentary Rocks (Biochemical)

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Agate Examples of chemical sedimentary rocks include: 2) Chert  is a name used for a number of very compact and hard rocks made of microcrystalline silica (e.g., flint, jasper, agate).  most formed in ocean.  occurs as layers (beds) & as irregular blobs in limestone.  marine creatures such as Diatoms and Radiolarian remove silica from sea water to make shells. Chemical Sedimentary Rocks (Biochemical)

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Examples of chemical sedimentary rocks include: 3) Limestone (Coral)  creating large quantities of marine limestone from their shells and external skeletons which are composed of calcium carbonate. 4) Chaulk  formed as a result of the build-up, compaction, and cementation of microscopic marine organisms (ex. Foraminiferia). Chemical Sedimentary Rocks (Biochemical)

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Examples of chemical sedimentary rocks include: 5) Coal  the end product of large amounts of plant material that has been buried and chemically altered over millions of years. Chemical Sedimentary Rocks (Biochemical)

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Biochemical Sedimentary Environments EnvironmentRock Types Swampcoal Shallow Marinecoquina, limestone (coral) Beachcoquina Deep Marinechaulk, chert Summary

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Example 1: Which is a biochemical sedimentary rock? (A)conglomerate(B) chaulk (C) sandstone(D) shale

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Example 2: Which biochemical sedimentary rock is made from microcrystalline silica? (A) coquina(B) coal (C) chert(D) limestone

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Your Turn... Take the time and complete the following questions... (Solutions to follow) Question: Which biochemical sedimentary rock seen to the right was deposited in a shallow marine environment? (A) coquina(B) coal (C) chert(D) jasper

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Solutions... Question: Answer: Which biochemical sedimentary rock seen to the right was deposited in a shallow marine environment? (A) chert (B) coal (C) coquina(D) jasper

Copyright © 2014 All rights reserved, Government of Newfoundland and Labrador Summary... Overview of Points covered:  Biochemical Sedimentary rocks include;  Coquina  Chert  Limestone (Coral)  Chaulk  Coal  Biochemical Sedimentary environments include;  Swamp  Shallow Marine (Ocean)  Beach  Deep Marine (Ocean)