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Eva Point to Driftwood Cove Geodiversity: Sandy Beaches Interspersed with Shore Platforms in Precambrian Rocks. Foredunes Typica

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Eva Point to Driftwood Cove Geodiversity: Sandy Beaches Interspersed with Shore Platforms in Precambrian Rocks. Foredunes Typica APCA Vehicle Track Assessment: Geoconservation, Flora and Fauna Values and Impacts 104 __________________________________________________________________________________________ 308: Incipient sandblow, Possum Banks, February 2006. 308: The same site 4.5 months later. Note evidence of sides collapsing as the blowout enlarges. Eva Point to Driftwood Cove 308: Looking north to Hazard Bay from near the 308: Ramp down to Driftwood Cove. junction with the Possum Creek Track. Geodiversity: Sandy beaches interspersed with shore platforms in Precambrian rocks. Foredunes typically steep and eroding. Flora: Beaches fringed by marram grassland (FMG) with some sea spurge infestations (FWU). Fauna: Numerous shorebirds sighted. Driftwood Cove to Dawson River APCA Vehicle Track Assessment: Geoconservation, Flora and Fauna Values and Impacts 105 __________________________________________________________________________________________ 308: Orange-bellied parrot exclosure north of Dawson 308: Partially consolidated calcareous sands exposed by Bay with pigface mounds (SCH) and exposed bedrock. erosion within the OBP exclosure. Geodiversity: Palaeosols and pinnacle-like remnants of partially consolidated calcareous sands crop out within the deflated area inside the ‘bird fence’, part of Site 25: Bird Fence-Gannet Point Dunes. The sand at this site have been dated to 13,100+/-1,600 years BP (W3976), which is comparable to dates obtained from other dunes formed in the informally named Possum Banks Sand. Stock entering the fenced area, which is buried by mobile sands at the northern end, are likely to exacerbate the rate at which this area is being deflated. Small springs emerge close to sea level at various points on the northern side of Dawson Bay. At least one of these is actively depositing tufa (calcium carbonate). Flora: (1) Marram grassland and sea spurge infestations at Driftwood Cove end (FMG/FWU); coastal heathland/scrub dominated by Leucopogon parviflorus, Beyeria lechenaultii, Banksia marginata and Acacia longifolia subsp. sophorae (SCA/SAC); Freshwater aquatic herbland (AHF); culturally induced Isolepis nodosa sedgeland (FRG) and marsupial lawns (GHC); low wind-pruned grassy heaths dominated by Beyeria lechenaultii (SCH) and Poa rodwayi grasslands (GTL; northwest variant); dry Melaleuca ericifolia scrubs (SSC); sea spurge infestations at river mouth (FWU). Significant species and communities: Poa rodwayi grasslands; aquatic wetland; rare woody shrub Spyridium vexilliferum var. vexilliferum. Fauna: Significant habitat for orange-bellied parrots, primarily Poa rodwayi grasslands and sea rocket (Cakile maritima), is present within the bird exclosure. Carex appressa sedgeland near the ‘bird fence’ is potential Marrawah skipper habitat. Dawson River to Gannet Point 308: Wet herbfields and grasslands subject to ORV 308: Grassy heaths and low scrubs south of Dawson impacts. River. 308: Wetland adjacent to track just south of Dawson 308: Eroded section of track between Dawson River and River. Dawkins Track. APCA Vehicle Track Assessment: Geoconservation, Flora and Fauna Values and Impacts 106 __________________________________________________________________________________________ Geodiversity: Rocky shore backed by vegetated dunes (Bird Fence-Gannet Point Dunes geoconservation site). Elevated cobble beaches are present at Gannet Point, part of the TGD-listed Tarkine High-level Cobble Beaches geoconservation site. Flora: Sea spurge infestations at river mouth (FWU); low coastal scrub dominated by Leucopogon parviflorus and Acacia longifolia subsp. sophorae, with Banksia marginata, Pteridium esculentum, Isolepis nodosa and Lepidosperma gladiatum (SAC); Poa rodwayi grassland (GTL; northwest variant); low wind-pruned grassy heaths with Beyeria lechenaultii prominent (SCH); wet herbfields and marsupial lawns (GHC). Towards Gannet Point the vegetation comprises low coastal scrub dominated by Leucopogon parviflorus and Hibbertia sericea (SSC); Isolepis nodosa sedgeland (FRG); marsupial lawns (GHC). Significant species and communities: Poa rodwayi grasslands; wetlands to east of track. Fauna: Some orange-bellied parrot habitat occurs in this area — at risk from vehicular damage and individuals being disturbed while foraging. Management issues: • Possum Banks is the most significant site within the APCA for flora conservation, supporting unique native grasslands and at least nine threatened flora species (Schahinger 2002 & 2005). The site is listed in the TGD as a geoconservation site of State significance. The geoconservation values and survival of the grasslands and associated flora/fauna are under immediate threat by the use of Possum Banks for cattle grazing and by ORVs using the native grassland as a ‘playground’. These activities are causing direct physical impacts to the flora and destabilising slopes now subject to major sandblows. The following actions should be undertaken as a matter of priority: (1) fence the area to exclude cattle and ORVs (as outlined in Schahinger 2005), and (2) initiate measures to stabilise the sandblows. • The beach at Hazard Bay is a significant habitat for shorebirds susceptible to disturbance from ORVs during the breeding season. • The rocky point between Ingram Bay and Hazard Bay (GR 308300E, 5428450N) is marked by steep ramps where the Possum Creek Track leads down to the beach on the northern and southern sides of the point. The gradient of the ramps (~20°) and their orientation perpendicular to slopes exposed to the prevailing wind, makes this site highly susceptible to the development of serious erosion problems. It is possible that some ORV users of the coastal route bypass the point using these ramps. • The section of track to the immediate south of Driftwood Cove passes through mobile sands, which have inundated fencing installed in the 1980s to protect foraging habitat for the orange-bellied parrot (Poa rodwayi grasslands and the introduced sea rocket) (Brown & Wilson 1984). The fence is now ineffective due to the shifting sand, creating an ongoing risk to the orange-bellied parrot habitat from ORVs and cattle entering the previously fenced area. Palaeosols and small towers formed in partially consolidated calcareous sands are also at risk. A small dune-barred wetland (GR 308660E 5427590N) and Carex appressa sedgeland (potential Marrawah skipper habitat) are also compromised. Further south, the track follows the crests of vegetated dunes formed in highly erodible sands with numerous middens. This sections passes through sensitive grassland and grassy heath vegetation. • The Dawson River to Gannet Point section of track follows erodible dune ridges through sensitive grassland and grassy heath vegetation. Track gradients are very steep in places (~18°) and the sandy substrates are deeply eroded. Small but presently intact wetlands at GR 309090E, 5426520N and 309110E, 5426580N are at risk of damage if ORV users do not stay on the main route. Grassy vegetation at Gannet Point has been impacted by day and/or overnight use. Recommendations: • Maintain the current PWS no vehicular access policy between Dartys Corner and its junction with the Gannet South Track (317). • Fence off native grassland areas at Possum Banks to exclude ORVs and cattle; the area that requires fencing is shown in Schahinger (2005). • Initiate stabilisation of sandblows at Possum Banks. • Reinstate the fence near the Bird Fence Track (314), to protect foraging habitat for the orange-bellied parrot. APCA Vehicle Track Assessment: Geoconservation, Flora and Fauna Values and Impacts 107 __________________________________________________________________________________________ Temma to Greenes Creek Track (309) Date assessed: Feb–July 2006 (various dates) Length: 14.3 km Map sheet: Temma 3043 & Ordnance 3042 Land system: Temma & Thornton Management zone: Natural (controlled access) Current access policy: Authorised with permit 309: Slumping of peat soils due to undercutting by wake 309: Braiding south of Balfour Track. from vehicles (summer conditions). 309: Water hole just south of Temma, under winter 309: Deeply churned up peat soils on recent bypass to conditions (July 2006). waterhole shown at left. 309: Unauthorised ‘racing track’ near Possum Banks. 309: Braided track on Precambrian rocks with Eucalyptus nitida heathy woodland (DNI). APCA Vehicle Track Assessment: Geoconservation, Flora and Fauna Values and Impacts 108 __________________________________________________________________________________________ Route: This track is the main route south from Temma to Kenneth Bay. The route parallels the coast about 1 km inland until it reaches Smiths Gulch, about 3.5 km from Greenes Creek. The track continues south from Greenes Creek towards Sandy Cape as the Kenneth Bay Track (402). Numerous sidetracks are present. Track condition: The condition of the track is highly variable along its length and between seasons. The first few kilometres south from Temma is marked by a series of deep holes that fill with water to bonnet level under winter conditions. The wake created by vehicles on the wet sections saps sand beneath an overlying fibrous peat soil, undercutting the sides and causing them to slump. At Pardoe Creek this process has caused small trees beside the track to topple over. Extensive areas of braiding have developed where drivers travel across country to avoid the more intimidating water holes which, despite their depth, generally have a firm base, improved at some sites with imported gravel. In contrast, bypass routes typically
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