Biodiversity Strategy - Gosford City Council - NSW Government

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Gosford soils occur predominantly on Triassic age sediments of the Wianamatta and Narrabeen Groups. These lie in the north-east part of a major tectonic unit known as the Sydney Basin. Middle Triassic Hawkesbury Sandstone occurs extensively on the Somersby Plateau and Macdonald Ranges. This overlies the Narrabeen Group and consists of medium to coarse grained quartz sandstones with minor shales and laminite lenses (Murphy 1993). It also outcrops on the Boudii peninsular, Kincumba Mountain and Mount Elliot. The eastern part of the LGA is predominantly the Terrigal (formerly Gosford) Subgroup of the Triassic Narrabeen Group. It consists of massive and coarse bedded lenticular beds of lithicquartz sandstone, siltstone and claystone (Murphy 1993). An example of the Terrigal formation can be seen at the Skillion in Terrigal which displays the distinctive fine sandstone with shale lenses (Fisher 1997). Small post Triassic diatremes outcrop at Peats Ridge and Kulnura on the Somersby Plateau. These are basalt intrusions that were forced through the overlying Hawkesbury sandstone during the Jurassic period (Fisher 1997). Quartenary alluvium occurs along major watercourses such as Brisbane Water and around the coastal estuaries. It consists of unconsolidated sands, silts, clays and gravels. Large deposits of Quartenary marine sediments are found along the coast and include barrier beach systems that enclose Tuggerah and Munmorah Lakes as well as the Umina/Ettalong/Woy Woy peninsular (see also 1:100, 000 geology sheet http://www.geoscience.gov.au). The Umina Woy Woy peninsular consists of a large sandplain with the remnants of its parallel dunes still evident in some places. Perched sand dunes occur on cliff tops within Bouddi National Park and adjacent areas (Strom et al.1980). A - 4.3 Geomorphology The broad physiographic (or geomorphological) regions of the Gosford region are described in Chapman and Murphy 1989 and Murphy 1993. These are: • McDonalds Ranges incorporating Mangrove Dam Creek catchment area and Kulnura in the north and Dharug National Park to the west. It consists of deeply dissected rugged steep hills on Hawkesbury sandstone and Narrabeen Group sediments. • Somersby Plateau covering the Central Mangrove area, Mangrove Mountain and Peats Ridge down to Somersby and Kariong on Hawkesbury sandstones. The Somersby Plateau forms a northern extension of the Hornsby Plateau and is described as an undulating plateau on Hawkesbury sandstone (Chapman and Murphy (1989) and Murphy (1993). It includes the Woy Woy peninsular but this would appear to be better described as per Bell(2004) as Coastal Floodplains and Estuaries incorporating the major floodplains of Erina and Narara Creeks that feed into Brisbane Water, the coastal estuaries and the Umina sandplain. • Hawkesbury Valley covering the drowned river valleys of the Hawkesbury River and its tributaries which dissect the rugged and distinctive Hawkesbury sandstone and softer Narrabeen Group sediments, and • Erina Hills covering the eastern parts of the LGA described as a low and undulating topography below 30 metres above sea level on Narrabeen Sandstone geology. The coastal plain has a low relief with a undulating to flat topography. • The Watagan Mountains region covers a small section in the north of the LGA at Niagara Park including Strickland State Forest. Streams dissect the plateau area exposing the softer interbedded siltstone and Sydney sandstone. Most flow in a southerly direction toward the Hawkesbury River and Broken Bay via Biodiversity - Technical Report Page 83
Mooney Mooney and Mangrove Creeks. Others cut into the eastern edge of the plateau flowing in an easterly direction towards the coastal lake A - 4.4 Soils Soil landscapes of Gosford City area described on two landscape sheets Soil Landscapes of the Gosford – Lake Macquarie 1:100,000 Sheet (Murphy 1993) and Soil Landscapes of the Sydney 1:100,000 Sheet (Chapman G A and C L Murphy 1989) and are summarised for the Gosford area with local examples in Table 2.1 and mapping in Figure 2.4. Table 4.1 Soil landscapes in Gosford City (Source: Chapman and Murphy 1989 and Murphy 1993) Landscape Group Soil Landscape Description Location examples Residual Landscape so Somersby Gently undulating to rolling rises of deeply weathered Hawkesbury Sandstone plateau, local relief to 40 m, slopes
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Gosford City Council BIODIVERSITY S
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CONTENTS 1 INTRODUCTION............
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A - 4.5 Climate ...................
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1 INTRODUCTION In accordance with C
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• Local interest groups such as B
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GOSFORD VISION 2025 INTERNATIONAL C
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Council is placing the information
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2 EXISTING SITUATION 2.1 Biodiversi
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ackdrop to areas of the City, conse
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Table 2: Statistics on Gosford's wa
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example, of the approximately 83 di
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• Biodiversity is best conserved
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6 Council to consider the developme
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Actions • Enhancing community edu
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5 Develop and implement strategies
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Appendix Gosford City Council BIODI
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CONTENTS APPENDIX GOSFORD CITY COUN
Page 35 and 36: A - 7.7 Human Interactions with Nat
Page 37 and 38: Genetic diversity is the variety of
Page 39 and 40: Biodiversity - Technical Report Pag
Page 41 and 42: A - 2.0 LEGISLATIVE CONTEXT The dev
Page 43 and 44: Amendment Act 2004 Standard Instrum
Page 45 and 46: areas within the Greater Metropolit
Page 47 and 48: A - 2.3.2 Council Corporate Reporti
Page 49 and 50: Biodiversity Toolbox The Commonweal
Page 51 and 52: A - 2.4 Discussion of Comparable Pl
Page 55 and 56: A - 2.6 References Australian Local
Page 57 and 58: • Bushcare Program - ongoing •
Page 59 and 60: A - 3.2 Appraisal of biodiversity p
Page 61 and 62: Officer Table 3.2. Area of properti
Page 63 and 64: and sub-communities and to provide
Page 65 and 66: the Central Coast. The returned sur
Page 67 and 68: Council received funding for develo
Page 69 and 70: Council commissioned the Bush Stone
Page 71 and 72: education and training opportunitie
Page 73 and 74: of urban development applications w
Page 75 and 76: Unmanaged cattle grazing can impact
Page 77 and 78: Three public schools in the catchme
Page 79 and 80: Milestone 5 - Monitoring and Report
Page 81 and 82: A - 3.4 References Australian Museu
Page 83 and 84: (see Figure 4. 3) which accounts fo
Page 85: Newcastle and forms a major barrier
Page 89 and 90: Aeolian Landscapes Beach Landscapes
Page 91 and 92: A - 4.5 Climate Generally the clima
Page 93 and 94: Kangaroo, possums, flying squirrels
Page 95 and 96: A - 4.9 Current Landuse Since the 1
Page 97 and 98: State government is also preparing
Page 99 and 100: A - 5.0 TERRESTRIAL BIODIVERSITY Th
Page 101 and 102: Lily) was once relatively widesprea
Page 103 and 104: Figure 5.1 Native vegetation commun
Page 107 and 108: There have been few quantitative st
Page 109 and 110: • Rainforest • Wetlands • Dun
Page 111 and 112: Figure 5.5 Endangered ecological co
Page 113 and 114: of streams for water quality purpos
Page 115 and 116: Figures 5.5 - 5.7 Waratah (Telopea
Page 117 and 118: A - 5.4 A - 5.4.1 Terrestrial Fauna
Page 119 and 120: A - 5.4.3 Invertebrates There conti
Page 121 and 122: A draft Recovery Plan has been prep
Page 123 and 124: assumption that occupancy of a site
Page 125 and 126: Variables such as ‘proportion of
Page 127 and 128: Mount Kincumba to Bouddi NP and Cop
Page 129 and 130: A - 5.7 References Anon (1996) 'Sev
Page 131 and 132: Scotts D (1991) “Old-growth fores
Page 133 and 134: A - 6.2 Aquatic Habitats A - 6.2.1
Page 135 and 136: considered. This is true for all ri
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this zone are isolated Casuarina gl
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The Hawkesbury River The Hawkesbury
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Gulls (Larus novaehollandiae); Pied
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Patonga Creek Little information is
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A particular objective of the above
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northeast lies the suburb of North
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Figure 6.11 Weedy Seadragon (Phyllo
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Lisarow Wetland Lisarow Wetland is
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• appropriately timed collection
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A - 6.3 References ANZECC (1992) Au
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Almost thirty key threatening proce
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Whilst these two species appear mor
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Low (1999) surmised that this fungu
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A - 7.8 Fire Management Fire manage
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1. Salinity mediated processes - Sa
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• Structural flood mitigation wor
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Increased needs for active recreati
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A - 7.14 References Anderson, C (20
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Biodiversity Strategy - Gosford City Council - NSW Government

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