NOTE: this document contains information on activities of the USGS
National Geologic Map Database Project. It is informal, generally
time-sensitive material intended for project members, cooperators, and
interested parties.
National Geologic Map Database Project
Possible extensions to CSDGM to handle geologic age
# Extensions to CSDGM to describe geological ages
#
# Peter N. Schweitzer (U.S. Geological Survey, Reston, VA 20192)
#
#
# Single_Date/Time =
# [ Calendar_Date + (Time_of_Day) | Geologic_Age ]
#
# Multiple_Dates/Times =
# 2{
# [ Calendar_Date + (Time_of_Day) | Geologic_Age ]
# }n
#
# Range_of_Dates/Times =
# [
# 1{Beginning_Date + (Beginning_Time) + Ending_Date + (Ending_Time)}1 |
# Beginning_Geologic_Age + Ending_Geologic_Age
# ]
#
#-------------------------------------------------------------------------
#
# Beginning_Geologic_Age =
# Geologic_Age
#
# Ending_Geologic_Age =
# Geologic_Age
#
# Geologic_Age =
# Radiometric_Age |
# Paleomagnetic_Stage |
# Oxygen_Isotopic_Stage |
# Chronostratigraphic_Unit |
# Biochronologic_Age
#
# Radiometric_Age =
# Radiometric_Age_Estimate +
# Radiometric_Age_Uncertainty +
# Radiometric_Age_Explanation
#
Local:
Name: Beginning_Geologic_Age
SGML: beggeol
Parent: Range_of_Dates/Times
Child: Geologic_Age
Local:
Name: Ending_Geologic_Age
SGML: endgeol
Parent: Range_of_Dates/Times
Child: Geologic_Age
Local:
Name: Geologic_Age
SGML: geologic
Parent: Single_Date/Time
Parent: Mutiple_Dates/Times
Child: Radiometric_Age
Child: Paleomagnetic_Stage
Child: Oxygen_Isotopic_Stage
Child: Chronostratigraphic_Unit
Child: Biochronologic_Age
Local:
Name: Radiometric_Age
SGML: radage
Parent: Geologic_Age
Child: Radiometric_Age_Estimate
Child: Radiometric_Age_Uncertainty
Child: Radiometric_Age_Explanation
Local:
Name: Radiometric_Age_Estimate
SGML: radagees
Parent: Radiometric_Age
Local:
Name: Radiometric_Age_Uncertainty
SGML: radageun
Parent: Radiometric_Age
Local:
Name: Radiometric_Age_Explanation
SGML: radageex
Parent: Radiometric_Age
Local:
Name: Paleomagnetic_Stage
SGML: paleomag
Parent: Geologic_Age
Local:
Name: Oxygen_Isotopic_Stage
SGML: oxyisost
Parent: Geologic_Age
Local:
Name: Chronostratigraphic_Unit
SGML: chronstr
Parent: Geologic_Age
Local:
Name: Biochronologic_Age
SGML: biochron
Parent: Geologic_Age
This page is <URL:http://ngmdb.usgs.gov/info/standards/metadata/meta_rptapp.html>
Last updated Sept. 12, 1997