Thursday, 17 July 2008

Erica lusitanica (Spanish Heath)

Erica lusitanica, Spanish Heath, Arve Rd, Southern Tasmania - 17th July 2008Peter Franklin has been campaigning to get the Erica lusitanica infestations on the Arve road dealt with for a few years. Anyway, they're still there.

Erica lusitanica, Spanish Heath, Arve Rd, Southern Tasmania - 17th July 2008About 450m west of Bennetts Road (Geeveston 1:25,000 Map, Ref 862217) there is a sizeable infestation in a creek depression, as well as along the side of the road.


Erica lusitanica, Spanish Heath, Arve Rd, Southern Tasmania - 17th July 2008There's another one on the inside of the corner where the Arve Rd turns left and Lidgerwood Rd joins it from straight ahead (Geeveston 1:25,000 Map, Ref 879225).


The State Government's management plan, I note, is not very positive about eradicating this weed. However, this location is near to the WHA, and perhaps it would be good to have a go. The Huon Valley Council considers (PDF 855KB) Spanish Heath to be a priority 4 weed, and as such I think it's unlikely they'll do anything. They seem to have this site and others on their map of weeds. The map of low priority weeds in their plan is like a nasty rash!



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Hartz Peak - 17th July 2008

Sunrise from the Hartz Mountains visitor shelter - 17th July 2008


Mt Picton from Hartz Peak - 17th July 2008Very enjoyable walk up Hartz Peak this morning. When I arrived at the parking area, there was only a slight breeze, and the car said it was 3°C. BoM says it was 2.4°C at nearby Keoghs Pimple, so maybe the car is quite accurate. Started walking just before 8am, and shortly before this there was a moment when the sun shone pink and gold through the misty clouds (above). Seemed to promise an improvement from the grey. Mt Picton made a good spectacle, so here are a couple of views. The first one has Mt Anne and Mt Weld to the right of the picture. Picton is also quite spectacular right now from Vinces Saddle, especially when the rising or setting sun catches the snow cover.


Mt Picton across Hartz Lake from the slopes of Hartz Peak - 17th July 2008Overall it wasn't too bad. Higher up the breeze picked up a fair bit and there is some annoyingly loose snow on the track in places, which slowed progress a little. Just below the pass and on the almost flat section around the western side of the peak ridge were the deepest, and I did a bit of uncoordinated and unbalanced floundering at times. The valleys were all filled with cloud, but at view-height, the clouds were racing around with the wind, opening and closing vistas in seconds. There were a few moments when the whole south-west could be seen clearly, but most of the time the view was largely or completely obscured.



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Monday, 14 July 2008

Aqueducts

Upper Aqueduct,Pipeline Track, Mt Wellington - 14th July 2008The aqueducts are a few minutes walk above Halls Saddle.

"A major problem confronting the designers of Hobart's original water supply around 1860 was how to get the water from the Mountain's southern slopes across Halls Saddle to the city outskirts. The solution was unusual in its extensive use of wooden and masonry troughing and associated sandstone features.

From dams across Fork Creek and Browns River, the water had to be conveyed across Longhill Creek, (now known as Dunns Creek) to the Saddle. A wooden bridge carrying troughs across the creek, built in 1862, was in serious disrepair by 1880 when a contract was let to stonemason Joseph Hawkes to build two sandstone bridges designed by the Director of Waterworks, C.W.S James. Sandstone for the bridges appears to have been quarried at Gentle Annie Falls and transported up the Pipeline Track. The work was completed by late 1881.

Lower Aqueduct, Pipeline Track, Mt Wellington - 6th April 2008As the pipeline progressed, the working conditions in which it was excavated and constructed became colder and wetter with only several months of good weather in a year. Debates and delays in Council over construction and funding meant this good weather was lost for the contractors and workers. The Council took some time to agree on stone bridges as opposed to an iron siphon, and it later was in dispute with the contractor over claimed additional expenses.

Sign on Upper Aqueduct, Pipeline Track, Mt Wellington - 6th April 2008

Much of the masonry troughing on the track has now been concealed underfoot. The cast iron pipes on the aqueducts are a later addition."

From Hobart City Council sign. The Pipeline Interpretation Project. An initiative of the Fern Tree Community Association, supported by the Hobart City Council. Original research by Lindy Scripps.

Mt Wellington Fungi - 14th July 2008

Fungi, Mt Wellington - 14th July 2008Nice gentle walk on the Pipeline Track today. One publishable fungi shot.

Sunday, 15 June 2008

Mt Wellington Fungi - 14th June 2008







Clavaria sp. - possibly C. corallinorosacea






Tentatively Russula lenkunya.



Sunday, 8 June 2008

Mary Ann Bay Rocks

At the north end of Mary Ann Bay there is an outcropping of sedimentary rocks in conjunction with the dolerite which predominates along this section of coast. In the photo, the dolerite forms the headland behind, and contrasts quite starkly with the outcrop in front. Looking at the rock, I suspect it is metamorphosed. My Hobart geological map doesn't help. There are Permian deposits in various places; I suspect this is rock which has been overlaid by the dolerite, and is probably from the Malbina Formation which is present elsewhere on South Arm. This rock is fairly gritty, and somewhat bedded, but not like the usual undisturbed sandstones around Hobart.

Sedimentary/metamorphic outcrop in Mary Ann Bay, South Arm - 7th June 2008At the south end of the bay the Mary Ann Bay Sandstone has overlain the weathered surface of the older dolerite. However, I'm unclear how this outcropped sandstone at the north end relates to the dolerite and Mary Ann Bay Sandstone. I'm pretty sure the northern outcrop is NOT Mary Ann Bay Sandstone; the description is wrong and I'm sure they'd have mentioned this easy-access outcrop on the beach in writing about the incidence of it at the south end. Next time I must find this Mary Ann Bay Sandstone, which has attracted quite a lot of interest over the years.

Saturday, 7 June 2008

South Arm, Arm End - 7th June 2008

Droughty Point and Ralphs Bay from Gellibrand Point at the end of South Arm - 7th June 2008
Today was a choice between Hartz Mountains and South Arm. The forecast was a bit ordinary, although it improved during the week, but in the end the day dawned damp, cloudy and drizzly in Huonville. The Keoghs Pimple weather station reported 99% humidity (clag) and an apparent temperature of -1.2° C. The weather in Huonville didn't promise any rapid improvement, so South Arm self-selected early. Sorry Peter! The walk around the end of South Arm (Arm End) starts at the very end of the road. You drive through South Arm and on to Opossum Bay, and then a little further until you reach a turning circle/parking area at the end of the road. It's labelled Arm End, but has also been known as the Gellibrand State Reserve.

Transmitter, White Rock Point, South Arm, Tasmania - 7th June 2008You either walk clockwise or anti-clockwise. The tracks are obvious inside the gate, so choose one and head off. The tracks are quite obvious to start with, but do disappear in places, or at least there are more than one choice. Basically you follow the coast all the way, and climb gradually up and down. There are tracks across the middle too, and if you wanted, the whole place is so open, you could just wander around wherever you liked. I recommend turning left, and heading for the obvious transmitter tower at White Rock Point. The tower here appears amongst other things to provide Taroona with some digital TV signals. The views from here of the cliffs south of Taroona are very good, as is the view of Mt Wellington usually (but not today!) The Shot Tower is very obvious. If you walk down beyond the radio mast, you can find some rocks just above sea level which are good to sit on. The views here are very good, and on a still day it is a very attractive place.


Unidentified deceased sea creature - possibly a Swimming Anemone?, Phlyctenactis tuberculosa - 7th June 2008From here you can follow the coast eastwards, and then northwards to descend to the beach on Mary Ann Bay. Walk along this beach, and then ascend through the trees at the far end. You could probably clamber around the rocks below the low cliffs, but there is easy walking at the higher level. Then keep walking north, and descend again to the beach with the ornate sculpted-sandstone headland.


Gellibrand Vault, Mary Ann Bay, South Arm - 7th June 2008The Gellibrand Vault is just south of this headland. You may notice it as you walk along the top, but if not, then walk a short way back along the beach and keep an eye out up the slopes. It is a little beset with landsliding dirt, and probably someone should look after it. Here lie several ancestors of the Gellibrand family, who donated this land to public ownership.


Inscription in memory of William Gellibrand on the Gellibrand Vault, South Arm - 7th June 2008The main inscription reads "In Respectful Memory of William Gellibrand Esquire J.P. the original grantee of South Arm. (and father of the first Attorney General of this Colony)...who died at Hobart Town 27th September 1840. Aged 75 Years. ...n illness of acute pain and suffering which he bore with Christian ...sion and resignation. His mortal remains lie in this vault beneath ...nder his own direction and superintendence. He was courteous and affable in his disposition, benevolent and generous in his character and of uncompromising integrity of purpose." His son, Joseph Tice Gellibrand, was the first Attorney-General of Tasmania.



Shells jammed together edgeways as cobbles, The Spit, South Arm - 7th June 2008Beyond here, it's a short climb and then a flat walk to the end of South Arm, where there is a view to the north of Droughty Point, and a fairly clear view up the Derwent to the Tasman Bridge, Mt Direction and even Selfs Point. From here there's a clear track back to the carpark around the eastern side of the Arm End. It's worth going down to the beach south of The Spit, which is very obvious as you head south. The easiest way is to keep walking until adjacent to the south end of the beach which runs south of The Spit, and follow the 4WD Track down the south side of the obvious fenceline. The track continues obviously back to the carpark past Shelly Beach. The shells on the Spit beach seem in many places to be "cobbled". That is they've been arrangec by the waves to stand on end in their thoudands (or maybe in their tens of thousands).