BUTE MAP 6: GARROCH HEAD to STRAVANNAN BAY

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1 BUTE MAP 6: GARROCH HEAD to STRAVANNAN BAY Hinterland Geology and Coastal Geomorphology: Old Red Sandstone and lavas form the principal base deposits and are overlain by marine deposits towards Port Dornoch. The coastal edge is sinuous and highly indented. Boulders and exposed rock platforms are present throughout this unit. From Port Dornoch to Barr Point, the shoreline is mainly dominated by raised beach with exposed low rock abrasion platforms. At Dunagoil Bay a raised beach terrace slopes down to the beach and has been modified by drainage, and at the seaward end, by blown sand. Old Red Sandstone occupies an area to the south of the bay. This is tilted and forms a c.50m wide abrasion platform. Boulders and shingle dominate the intertidal area with sand present at Dunagoil Bay. From Barr Point to Lubas Point, the hinterland geology is dominated by Old Red Sandstone which is overlain by successive episodes of marine sediment deposition. Lubas Point is a volcanic crag with fine views of Lubas Bay, and a beach composed of dark grey angular boulders. At Stravannan Bay three episodes of former marine shoreline formation are represented and extend well inland. Erosion Class: From Garroch Head to Port Dornoch, the coastline is exposed to south-westerly gales and is classified as stable and eroding. The abrasion platforms are being formed as a result of ongoing cliff recession, at an uncertain rate. From Port Dornoch to Barr Point, the coastline is classified as stable, although the abrasion platforms present throughout the area outside of Dunagoil Bay show that erosion is ongoing albeit at a rate that is not measurable. Stability is afforded by grassy terraces at the head of the bay. From Barr Point to Lubas Port, the coastline is classified as definitely eroding. Isolated areas of erosion were identified along the raised beach and till deposits. These sand and clay dominated deposits tend to be affected by mass movement and slumping, creating an admixture of clay soil from the till overburden. From Lubas Port to Stravannan Bay, the coastline is classified as accreting and eroding. Accretion is occurring at the head of Stravannan Bay, where wind-blown sand is building up. Areas of broken machair, with localised minor wind and grazing erosion, are present behind the frontal machair ridge at the north end of the bay near an old dyke. The rock abrasion platforms flanking the bay are eroding slowly. Built Heritage & Archaeology: Few sites were noted, although towards Port Dornach a cluster of sites was observed. In a small valley leading to the shore at Barr Hill two drystone dykes, upstanding to c.0.75m high, were possibly used to prevent livestock from getting down to the shore, since they seem to block the only access to the water in this area. At Port Dubh a small boathouse, jetty and slipway are in poor condition, although of substantial construction. A cast iron boat winch lies opposite the slipway. Dunagoil Fort (NS05SE 4) is located at Port Dornach and is in good condition. A cluster of sites were noted around Port Dornach towards Dunagoil Bay. These were mainly prehistoric sites such as Dunagoil Fort and Little Dunagoil Fort. Several caves were noted in the craggy outcrops upon which these forts sat. Some of the caves have been excavated in the past to reveal middens of varying antiquity. Cultivation remains in the form of rig and furrow marks were also seen close by. The high concentration of sites suggests that the area was once busy and populous and probably of some importance. In the intertidal zone of this cell an eroding fish trap was seen in Lubas Bay. In the hinterland, Dunstrone Fort and a field system were noted. FICL/876/0/27/7/04 60 of 219 CFA

2 BUTE MAP 6: HINTERLAND GEOLOGY AND COASTAL GEOMORPHOLOGY 1. GARROCH HEAD to LITTLE 5. LUBAS PORT FORT NS NS km 0.7km Mainly rock platform Mainly rock platform Cliff (<10m) Low Cliff (<5m) Drift deposits Marine deposits This section of coastline, as with the previous one, This section has a wide exposed abrasion platform is subjected to the full fetch of south westerly coastline exposed down to the LWMST. The gales. Abrasion platforms dominate the hinterland has raised beach deposits overlying shoreline. The hinterland consists of boulder clay solid geology. over outcropping bedrock. 2. BAY 6. STRAVANNAN BAY NS NS km 0.7km Mainly sand and shingle Sand and shingle Low edge (<5m) Low Cliff (<5m) Marine deposits Low level basin area with distinct level terraces on the hinterland area. A raised beach terrace slopes down to the beach. The beach consists of reddish sand, shingle and boulders. Sand is exposed down to the LWMS area. Marine deposits The hinterland is dominated by machair environment breaking into irregular dune-like topography near the south stream inlet. Sand and shingle dominate the beach. The margins of the bay are flanked by exposed rock platforms down to the LWMS.. 3. NORTH of BAY 7. NORTH of STRAVANNAN BAY NS NS km 0.7km Mainly rock platform Mainly rock platform Low edge (<5m) Cliff (<10m Drift deposits on outcropping rock This small section of coastline lies between Dunagoil Bay and Lubas Bay and consists of shelving rock abrasion platforms down to the LWMST. The hinterland rises steeply and contains superficial deposits of boulder clay. 4. LUBAS BAY NS km Mainly sand and boulders Low edge (<5m) Drift deposits on outcropping rock A small bay with shingle banked at MHWMS. Raised beaches overlook the bay. Drift deposits This section of coastline, as with the previous one, is subjected to the full fetch of south westerly gales. Abrasion platforms dominate the shoreline. The hinterland consists of boulder clay over outcropping bedrock. FICL/876/0/27/7/04 61 of 219 CFA

3 BUTE MAP 6 - HINTERLAND GEOLOGY AND FORESHORE GEOMORPHOLOGY Garroch Head to Stravanan Bay km LEGEND Scale 1:25,000 GREENOCK HELENSBURGH DUMBARTON ROTHESAY CLYDEBANK Crown Copyright. All rights reserved [Historic Scotland] [ ][2005] FICL/876/0/27/7/04 62 of 219 CFA

4 BUTE MAP 6: EROSION 1 GARROCH HEAD to LITTLE FORT 8. NORTH of STRAVANNAN BAY NS NS km 2.9km Definitely eroding Definitely eroding Rock abrasion platform is exposed and being This section of coast is very exposed and this has resulted in extensive abrasion platforms, deep skerries and an indented cliff. 2. BAY NS km Accreting or stable The bay is receiving shingle which is banked at the HWMS mark. The flanking cliffs tend to focus this material to the head of the bay during storm conditions. 3. BAY to BARR POINT NS km Definitely eroding Exposed section of abrasion platform eroding slowly. 4. LUBAS BAY NS km Both accreting and eroding Lubas Bay is being nourished by gravel. Some cattle erosion is leading to local erosion at the HWMS. 5. LUBAS PORT NS km Definitely eroding This section of coastline has exposed low rock abrasion platforms and deep skerries that are effected by scouring. 6. STRAVANNAN BAY NS km Accreting or stable Shingle and sand is accreting along the head of the bay. 7. NORTH of STRAVANNAN BAY NS km Definitely eroding Rock abrasion platform eroded into skerries. eroded by scouring. Raised beach fronted by fossil shoreline. Irregular cliff overlooking a promontory with exposed rock platforms. At Gullachan Bay has a shingle beach flanked by rock platform. FICL/876/0/27/7/04 63 of 219 CFA

5 BUTE MAP 6 - EROSION CLASS Garroch Head to Stravanan Bay km Scale 1:25,000 HELENSBURGH LEGEND GREENOCK DUMBARTON ROTHESAY CLYDEBANK Crown Copyright. All rights reserved [Historic Scotland] [ ][2005] FICL/876/0/27/7/04 64 of 219 CFA

6 BUTE MAP 6: BUILT HERITAGE AND ARCHAEOLOGY Sites on the Coast Edge & Foreshore 100. PORT DUBH NS Boathouse/jetty/slipway Poor 18 th -20 th AD Monitor 102. NS05SE 15 NS Field Clearance Cairns 103. PORT DORNACH NS05SE 31 NS Landing place 104. NS05SE 29 NS Cultivation remains (rig) 105. NS05SE 30 NS Farmstead 106. LUBAS BAY NS Fish trap (possible) Poor Survey 109. LUBAS PORT NS05SE 34 NS Buildings/Field systems Sites on the Hinterland 98. BARR HILL NS Dyke Poor 99. BARR HILL NS Dyke Poor 18 th -20 th AD 101. Group entry NS Mound LITTLE NS05SE 3 NS Cup-marked Stone; Longhouse NS05SE 4 NS Fort NS05SE 7 NS Cist; chambered cairn (poss) NS05SE 11 NS Cave/midden 4 th Mil BC-1BC Survey/Monitor FICL/876/0/27/7/04 65 of 219 CFA

7 BUTE MAP 6: BUILT HERITAGE AND ARCHAEOLOGY Continued Sites on the Coast Edge & Foreshore 110. KINGARTH NS SAM 400 Standing Stones 4thMil-1BC Sites on the Hinterland LITTLE NS05SE 12 NS Cave, midden Unkown Survey NS05SE 13 NS Cists, barrows 4 th Mil BC-1BC LITTLE NS05SE 14 NS Fort, enclosure, dyke, caves and longhouses Fair 1 st Mill BC 1 st Mill AD NS05SE 25 NS Rock shelter 107. LUBAS FARM AND STEADING NS05SE 38 NS Listed C(s) 18 th -20 th AD 108. DUNSTRONE NS05SE 1 NS Fort Fair FICL/876/0/27/7/04 66 of 219 CFA

8 BUTE MAP 6 - BUILT HERITAGE AND ARCHAEOLOGY Garroch Head to Stravanan Bay km Scale 1:25,000 HELENSBURGH LEGEND GREENOCK DUMBARTON ROTHESAY CLYDEBANK Crown Copyright. All rights reserved [Historic Scotland] [ ][2005] FICL/876/0/27/7/04 67 of 219 CFA

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