  We describe the first results from a comprehensive study of the distant
cluster Cl0024+1654 (z=0.39) based upon a pattern of 38 mosaiced HST-WFPC2
images extending to radii ~5Mpc. These are being analysed in conjunction with
extensive spectroscopy conducted with the CFHT, WHT, and Keck Telescopes. The
overall goal is to understand the morphological transformations and associated
short-term star formation histories of representative numbers of infalling
field galaxies in the context of the cluster potential as defined by weak
lensing studies. Our HST database contains over 2000 galaxy morphologies to
I=22.5. Spectroscopic data and HST morphologies are currently available for
about 215 members over an unprecedented range of environments. We confirm the
existence of a well-defined morphology-density relation over a large dynamic
range within a single system at a significant look-back time. Tentative trends
in the E/S0 fraction as a function of radius are discussed. A weak lensing
signal in the background galaxies has been detected at the cluster periphery
and its inversion demonstrates only marginal substructure. A
statistically-significant galaxy-galaxy lensing signal has also been seen for
the cluster members. Further work will relate radial dependencies in the dark
matter and halo masses in the context of spectroscopic and morphological
diagnostics of truncated star formation.
