Data Set Citation:
When using this data, please cite the data package:
NCEAS 12081: Lockwood: RarityAndExtinction , NCEAS 3980: Alroy: Paleobiology Database (Hosted by NCEAS) , National Center for Ecological Analysis and Synthesis , and Lockwood R. 2008.
Lockwood: Late Cretaceous Molluscan Abundance Data (Sohl and Koch)
nceas.931.8 (http://knb.ecoinformatics.org/knb/metacat/nceas.931.8/nceas)
General Information:
Title:Lockwood: Late Cretaceous Molluscan Abundance Data (Sohl and Koch)
Identifier:nceas.931
Abstract:
This data set contains abundance data for fossil mollusk genera from the Late Cretaceous of the U.S. Coastal Plain published by Sohl and Koch (1983, 1984, 1987). It also contains global stratigraphic ranges, global geographic ranges, and taxonomic information for genera, downloaded from the Paleobiology Database (PBDB) at http://paleodb.org in February 2008. This data set is used to examine the link between rarity and extinction across the end-Cretaceous mass extinction in Coastal Plain mollusks.
Keywords:None:
  • fossil
  • mollusk
  • Cretaceous
  • Maastrichtian
  • U.S. Coastal Plain
  • rarity
  • abundance
  • survivorship
  • selectivity
  • extinction
  • KT extinction
Publication Date:2008-05-27
Data Table, Image, and Other Data Details:
Metadata download: Ecological Metadata Language (EML) File
Data Table:lockwood_traits.csv ( View Metadata | Download File download)
Data Table:lockwood_abundance.csv ( View Metadata | Download File download)
Other Data:lockwood_transform.r ( View Metadata | Download File download)
Other Data:lockwood_recreate.r ( View Metadata | Download File download)

Involved Parties

Data Set Creators:
Organization:NCEAS 12081: Lockwood: RarityAndExtinction
Organization:NCEAS 3980: Alroy: Paleobiology Database (Hosted by NCEAS)
Organization:National Center for Ecological Analysis and Synthesis
Individual: Rowan Lockwood
Organization:NCEAS
Address:
Department of Geology, College of William and Mary, PO Box 8795,,
Williamsburg, Virginia 23187-8795 USA
Phone:
757-272-2125 (voice)
Phone:
757-221-2093 (Fax)
Email Address:
rxlock@wm.edu
Data Set Contacts:
Individual: Rowan Lockwood
Organization:NCEAS
Address:
Department of Geology, College of William and Mary, PO Box 8795,,
Williamsburg, Virginia 23187-8795 USA
Phone:
757-272-2125 (voice)
Phone:
757-221-2093 (Fax)
Email Address:
rxlock@wm.edu
Associated Parties:
Individual: Rowan Lockwood
Metadata Providers:
Individual: Rowan Lockwood

Data Set Characteristics

Geographic Region:
Geographic Description:U.S. Coastal Plain, including Texas, Mississippi, Alabama, Georgia, South Carolina, Tennessee, Missouri, Arkansas, Maryland, New Jersey.
Bounding Coordinates:
West:  -106.0000  degrees
East:  -74.0000  degrees
North:  32.0000  degrees
South:  40.0000  degrees
Time Period:
Begin:
1920
End:
1987
Taxonomic Range:
Classification:
Rank Name:Mollusca
Rank Value:Class

Sampling, Processing and Quality Control Methods

Step by Step Procedures
Step 1:  
Description:

Sohl and Koch 1983, 1984, 1987 methods

Fossil abundance data for mollusks collected from bulk and non-bulk samples. See Sohl and Koch for more details:

Sohl and Koch 1983, 1984, 1987. USGS Open File Report 83-451; 84-687, 87-194.

Global stratigraphic and geographic range data downloaded from the PBDB February 2008 using "Analyze taxonomic range" tool.

Taxonomic data downloaded from the PBDB February 2008.

See metadata column descriptions for more detail.
Step 2:  
Description:

R Script was used to transform the data table

R Software version 2.7.0 from the R Project for Statistical Computing at (http://www.r-project.org) was used to transform the data tables to make it easier to document the original table. The script is included in this data set as a dowloadable r file called lockwood_transform.r. There is also a lockwood_recreate.r script that will recreate Rowan Lockwood's original data table by joining the two tables that are stored in the data repository.
Sampling Area And Frequency:
Original fossil abundance data compiled by Sohl and Koch from the literature and their own field samples up until 1980's. Taxonomic, stratigraphic, and geographic range data compiled in PBDB.
Sampling Description:
Fossil abundance data collected in part via bulk sampling.

Data Set Usage Rights

Obtain permission from data set owner(s)
Access Control:
Auth System:knb
Order:denyFirst
Additional Metadata
Metadata download: Ecological Metadata Language (EML) File