Changes

  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

}}

}}

Parasequences are deposited during fourth- or fifth-order eustatic cycles. They are generally [[Depocenter#Sediment_supply_rate_and_facies_patterns|progradational]] and have a shoaling-upward association of facies.<ref name=ch21r47>Van Wagoner, J., C., Mitchum, R., M., Campion, K., M., Rahmanian, V., D., 1990, Siliciclastic [[Sequence stratigraphy]] in Well Logs, Cores and Outcrops: Concepts for High-Resolution Correlation of Time and Facies: [http://store.aapg.org/detail.aspx?id=1196 AAPG Methods in Exploration Series No. 7], 55 p.</ref> In siliciclastic parasequences, grain size can either fine or coarsen upward, reflecting an upward decrease in water depth. Some workers<ref name=ch21r45>Van Wagoner, J., C., 1995, [http://archives.datapages.com/data/specpubs/memoir64/front/000i.htm Overview of sequence stratigraphic foreland basin deposits: terminology, summary of papers, and glossary of sequence stratigraphy], in Van Wagoner, J., C., Bertram, G., T., eds., Sequence Stratigraphy of Foreland Basin Deposits: Outcrop and Subsurface Examples from the Cretaceous of North America: [http://store.aapg.org/detail.aspx?id=146 AAPG Memoir 64], p. ix–xxi.</ref> consider fourth-order sequences (deposited during cycles 100,000–200,000 years in duration) to be the building blocks of most reservoir or field studies.

Parasequences are deposited during fourth- or fifth-order eustatic cycles. They are generally [[Depocenter#Sediment_supply_rate_and_facies_patterns|progradational]] and have a shoaling-upward association of facies.<ref name=ch21r47>Van Wagoner, J., C., Mitchum, R., M., Campion, K., M., Rahmanian, V., D., 1990, Siliciclastic Sequence stratigraphy in Well Logs, Cores and Outcrops: Concepts for High-Resolution Correlation of Time and Facies: [http://store.aapg.org/detail.aspx?id=1196 AAPG Methods in Exploration Series No. 7], 55 p.</ref> In siliciclastic parasequences, grain size can either fine or coarsen upward, reflecting an upward decrease in water depth. Some workers<ref name=ch21r45>Van Wagoner, J., C., 1995, [http://archives.datapages.com/data/specpubs/memoir64/front/000i.htm Overview of sequence stratigraphic foreland basin deposits: terminology, summary of papers, and glossary of sequence stratigraphy], in Van Wagoner, J., C., Bertram, G., T., eds., Sequence Stratigraphy of Foreland Basin Deposits: Outcrop and Subsurface Examples from the Cretaceous of North America: [http://store.aapg.org/detail.aspx?id=146 AAPG Memoir 64], p. ix–xxi.</ref> consider fourth-order sequences (deposited during cycles 100,000–200,000 years in duration) to be the building blocks of most reservoir or field studies.

==Periodic vs. episodic parasequences==

==Periodic vs. episodic parasequences==