tbl_tephras

0 rows


Description

Details of volcanic tephra layers, including their age estimates (e.g., Hekla 1984).

Columns

Column Type Size Nulls Auto Children Parents Comments
tephra_id int4 10 √
tbl_tephra_dates.tephra_id fk_tephra_dates_tephra_id R
tbl_tephra_refs.tephra_id fk_tephra_refs_tephra_id R

Primary key (automatically incremented).
c14_age numeric(20,5) 20,5 √

Radiocarbon age of the tephra layer.
c14_age_older numeric(20,5) 20,5 √

Upper limit of the radiocarbon age range.
c14_age_younger numeric(20,5) 20,5 √

Lower limit of the radiocarbon age range.
cal_age numeric(20,5) 20,5 √

Calibrated age of the tephra layer.
cal_age_older numeric(20,5) 20,5 √

Upper boundary of the calibrated age range.
cal_age_younger numeric(20,5) 20,5 √

Lower boundary of the calibrated age range.
date_updated timestamptz 35,6 √
notes text 2147483647 √

Additional information or remarks about the tephra layer.
tephra_name varchar(80) 80 √

Name of the tephra layer, such as a specific volcanic event.
tephra_uuid uuid 2147483647

Indexes

Constraint Name Type Sort Column(s)
tbl_tephras_pkey Primary key Asc tephra_id
unique_tbl_tephras_tephra_uuid Must be unique Asc tephra_uuid

Relationships

Close relationships within degrees of separation