  Production of Sigma- and Lambda(1520) in hadronic Z decays has been measured
using the DELPHI detector at LEP. The Sigma- is directly reconstructed as a
charged track in the DELPHI microvertex detector and is identified by its Sigma
-> n pi decay leading to a kink between the Sigma- and pi-track. The
reconstruction of the Lambda(1520) resonance relies strongly on the particle
identification capabilities of the barrel Ring Imaging Cherenkov detector and
on the ionisation loss measurement of the TPC. Inclusive production spectra are
measured for both particles. The production rates are measured to be
  <N_{Sigma-}/N_{Z}^{had}> = 0.081 +/- 0.002 +/- 0.010,
  <N_{Lambda(1520)}/N_{Z}^{had}> = 0.029 +/- 0.005 +/- 0.005.
  The production rate of the Lambda(1520) suggests that a large fraction of the
stable baryons descend from orbitally excited baryonic states. It is shown that
the baryon production rates in Z decays follow a universal phenomenological law
related to isospin, strangeness and mass of the particles.
