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The nature of galaxy structures on large scales is a key observationalprediction for current models of galaxy formation. The SDSS and 2dF galaxysurveys have revealed a number of structures on 40-150 h^-1 Mpc scales at lowredshifts, and some even larger ones. To constrain galaxy number densities,luminosities, and stellar populations in large structures at higher redshift,we have investigated two sheet-like structures of galaxies at z=0.8 and 1.3spanning 150 h^-1 comoving Mpc embedded in large quasar groups extending overat least 200 h^-1 Mpc. We present first results of an analysis of thesesheet--like structures using two contiguous 1deg GALEX fields (FUV and NUV)cross-correlated with optical data from the Sloan Digital Sky Survey (SDSS). Wederive a sample of 462 Lyman Break Galaxy (LBG) candidates coincident with thesheets. Using the GALEX and SDSS data, we show that the overall averagespectral energy distribution of a LBG galaxy at z~1 is flat (in f_lambda) inthe rest frame wavelength range from 1500A, to 4000A, implying evolvedpopulations of stars in the LBGs. From the luminosity functions we getindications for overdensities in the two LQGs compared to their foregroundregions. Similar conclusions come from the calculation of the 2-pointcorrelation function, showing a 2sigma overdensity for the LBGs in the z~0.8LQG on scales of 1.6 to 4.8 Mpc, indicating similar correlation scales for ourLBG sample as their z~3 counterparts.

The Clowes-Campusano Large Quasar Group Survey: I. GALEX selected sample of LBGs at z$\sim$1