stratumheight double precision,

  stratumbase double precision,

  stratumcover double precision,

  CONSTRAINT stratum_pkey PRIMARY KEY (stratum_id ),

  CONSTRAINT stratum_locationevent_id FOREIGN KEY (locationevent_id)

      REFERENCES locationevent (locationevent_id) MATCH SIMPLE

  stratumheight double precision,

  stratumbase double precision,

  stratumcover double precision,

);

CREATE TABLE sizeclass -- A range of size measurements used to aggregate organisms.

  stratumheight double precision,

  stratumbase double precision,

  stratumcover double precision,

  CONSTRAINT stratum_pkey PRIMARY KEY (stratum_id ),

  CONSTRAINT stratum_locationevent_id FOREIGN KEY (locationevent_id)

      REFERENCES locationevent (locationevent_id) MATCH SIMPLE

    stratumtype_id integer NOT NULL,

    stratumheight double precision,

    stratumbase double precision,

);