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We report on the {\lambda} = 5-36{\mu}m Spitzer Infrared Spectrograph spectraof 79 young stellar objects in the very young nearby cluster NGC 1333. NGC1333's youth enables the study of early protoplanetary disk properties, such asthe degree of settling as well as the formation of gaps and clearings. Weconstruct spectral energy distributions (SEDs) using our IRS data as well aspublished photometry and classify our sample into SED classes. Using"extinction-free" spectral indices, we determine whether the disk, envelope, orphotosphere dominates the spectrum. We analyze the dereddened spectra ofobjects which show disk dominated emission using spectral indices andproperties of silicate features in order to study the vertical and radialstructure of protoplanetary disks in NGC 1333. At least nine objects in oursample of NGC 1333 show signs of large (several AU) radial gaps or clearings intheir inner disk. Disks with radial gaps in NGC 1333 show more-nearly pristinesilicate dust than their radially continuous counterparts. We compareproperties of disks in NGC 1333 to those in three other well studied regions,Taurus-Auriga, Ophiuchus and Chamaeleon I, and find no difference in theirdegree of sedimentation and dust processing.

A Spitzer IRS Survey of NGC 1333: Insights into disk evolution from a very young cluster