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We present the results of a systematic mapping of seasonally sculptedterrains on the South Polar region of Mars with the Planet Four: Terrains (P4T)online citizen science project. P4T enlists members of the general public tovisually identify features in the publicly released Mars Reconnaissance OrbiterCTX images. In particular, P4T volunteers are asked to identify: 1) araneiforms(including features with a central pit and radiating channels known as'spiders'); 2) erosional depressions, troughs, mesas, ridges, andquasi-circular pits characteristic of the South Polar Residual Cap (SPRC) whichwe collectively refer to as 'Swiss cheese terrain', and 3) craters. In thiswork we present the distributions of our high confidence classic spideraraneiforms and Swiss cheese terrain identifications. We find no locationswithin our high confidence spider sample that also have confident Swiss cheeseterrain identifications. Previously spiders were reported as being confined tothe South Polar Layered Deposits (SPLD). Our work has provided the firstidentification of spiders at locations outside of the SPLD, confirmed with highresolution HiRISE imaging. We find araneiforms on the Amazonian and Hesperianpolar units and the Early Noachian highland units, with 75% of the identifiedaraneiform locations in our high confidence sample residing on the SPLD. Withour current coverage, we cannot confirm whether these are the only geologicunits conducive to araneiform formation on the Martian South Polar region. Ourresults are consistent with the current CO2 jet formation scenario with theprocess exploiting weaknesses in the surface below the seasonal CO2 ice sheetto carve araneiform channels into the regolith over many seasons. These newregions serve as additional probes of the conditions required for channelcreation in the CO2 jet process. (Abridged)

Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits