Signs of the ancient and dynamic Earth

Photo1: The once horizontal sandstone layers are now almost vertical – folded and tilted by shifting tectonic plates.

The mysterious sandstone layers of Castlemaine and Chewton are one of the most defining characteristics of the local bush. Like the bones of some ancient earthly animal, they form a pattern of upstanding ribs that hold clues to the land’s long evolution. Under a microscope, the sandstone is made up of untold billions of sand grains, and many have the distinctive features of grains derived from a granitic terrain – most probably the ancient Gondwanan mountains that rose to our west some 480 million years ago. The mountains were weathered down and rivers carried grain after grain to the ocean floor further east, showing us recycling is nothing new!

Having survived that little trauma, the grains remained happily undisturbed for 40 million years in their ocean floor beds. Then suddenly they were subjected to the relentless forces of plate tectonics. All the layers were squashed between the ancient Gondwana continent margin and the palaeo-Pacific tectonic plate to the east. These forces just happened to be east-west and so all the folded layers now run north-south forming a handy visual compass for our ramblings in the bush.

The sandstones of the bush might look ancient and immovable but they remind us of our dynamic Earth and the constant recycling of, well, everything!

Photo 2: The sandstone is stained by iron-bearing minerals and is cut by cracks, called joints

This is the eighth post in our geology series written by Clive Willman. 

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Here’s an answer–Oh…but what was the question?

FOBIF has received an answer from Forest Fire Management to its submission on current plans for management burns in this area.

We print the answer in full below. You can check to see if it answers any of the questions in our submission.We don’t believe it does.

This kind of exchange, or non-exchange, is an example of one of the problems of ‘consultation’: questions are asked, answers are given…but there doesn’t seem to be any connection between the two.

Part of the problem is that we, and other concerned groups, keep asking questions about specific places: and we want specific answers to these questions. Either the Department doesn’t have the answers, or the officers don’t actually have the time to pay attention to each submission. The result casts doubt on the value of the ‘consultation’ process.

Looking north from the Wewak Track, August 2022: the dark green is carpets of Matted Bush-pea. Is it a high fire risk? The area is slated for ‘fuel reduction’, but it seems impossible to get details through the consultation process as to how the burn will be managed.

Readers can judge for themselves. Here’s the DELWP response to our submission:

‘Thank you for your letter explaining your concerns regarding fuel reduction burns listed on the Loddon Mallee Joint Fuel Management Program (JFMP) 2022/23-2024/25.

‘Strategic Fuel Breaks (SFB) work together with our zoning by establishing areas of reduced fuel that support planned burn operations to be conducted adjacently. The SFB program has been developed in conjunction with our planned burning program.

‘We carry out a range of on-ground preparation works before the burn to ensure that the planned area is safe to ignite when the conditions are right. Planned burn preparation is essential for the safety of fire crews and the community. Preparation works may include raking around trees to protect habitat trees, removing hazardous trees to make the burn safer for fire crews, grading the existing roads and tracks to improve access and reduce the risk of the burn escaping. We’ll adjust ignition and monitor fire behaviour to meet appropriate burn objectives, which is supported by the advancements in weather forecast products, burn prescriptions and smoke modelling.

‘Forest Fire Management Victoria (FFMV) continues to collect fuel hazard data pre and post burn for a selection of our high priority burns in the Asset Protection (APZ) and Bushfire Moderation (BMZ) Fire Management Zones, covering at least 20 per cent of burns. We collect this information as part of our tracking of progress toward strategy implementation and into inform our understanding of fuel recovery rates. For example, we have also used this fuel hazard data, collected over many years in Box-Ironbark forests, to update our fuel models used for decision making.

‘As part of the Victorian Bushfire Monitoring Program, FFMV is working to improve our specific understanding of fire effects on the environment – this includes both planned burning and bushfire. In the Box-Ironbark forests, there is a statewide project that the Department of Environment, Land, Water and Planning has contracted the University of Melbourne to undertake through the Bushfire Hazards Cooperative Research Centre. This work commenced early in 2021.

‘We look forward to future constructive collaborations with the Castlemaine community and encourage you to continue to share data and your concerns with us as we endeavour to find the balance between protection of communities and the environment from bushfire.

Yours sincerely’

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Reminder about FOBIF AGM on 12 September

As outlined in a previous post, the FOBIF AGM will be held in the Ray Bradfield Room on 12 September beginning at 7.30. After a short time for AGM formalities Patrick Kavanagh will deliver on talk on Photographing Nature. Patrick has contributed to all of our FOBIF photography shows. He describes his interest in photograph in the following words:

I live in the woodlands of Central Victoria, where I am so often amazed and moved by the natural wonders that surround me. The vastness of the night sky, the magic of a small bird safe to come so close, the other-worldly grace of an insect, the purity of refraction in a dew drop on a moss. With my camera, I try to hold onto some of these extraordinary glimpses and to share them.

Photos by Patrick Kavanagh

If you would like to nominate for the FOBIF Committee see details in this previous post

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Next Sunday’s walk, 21 August

Next Sunday’s walk led by Barb Guerin and Lionel Jenkins will be in the Metcalfe Nature Reserve. This is about 20 km east of Castlemaine. The walk will be approximately 7 km. If you would prefer to join the group closer to the start of the walk meet at the Metcalfe Hall on the Kyneton-Metcalfe Road, near the corner of Wilsons Road) at 9.45. For further information ring Barb and Lionel on 5472 1994.

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AGM!

The FOBIF Annual General Meeting will be held at the Ray Bradfield Rooms, Castlemaine, on Monday September 12th at 7.30. All members and supporters are welcome.

The guest speaker at the meeting will be Patrick Kavanagh, who will talk on Photographing Nature. Patrick’s photos are brilliant to look at, and absorbingly informative. You can check out a few of them here.

Nominations are now invited for positions on the FOBIF committee. You don’t need a special form: just send the name of the nominated person, the position nominated for, and names of a nominator and seconder who are FOBIF members. Nominations can be sent to the FOBIF address, which you can find by clicking on the Contact box above.

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FOBIF’s walks guide: an update!

Parks Victoria is currently undertaking landscaping works around the Garfield Wheel in the Castlemaine Diggings NHP. These have changed the nature of the signage in the area, and therefore affect the directions we have given for Walk 8 in our book, 20 walks in the Mount Alexander region.

New landscaping around the Garfield Wheel foundations: though unfinished, they’re already an improvement to the precinct…and will be even better if they eliminate weeds in the area.

As at August 7, the directions to proceed from the wheel towards the Welsh Village in this walk are as follows: take your bearings from the Goldfields Track sign (pictured). Walk forward (direction Castlemaine) about a hundred metres to the yellow topped walk post. Disregard it, and take the track about 10 metres to its right, currently marked by dark posts, with no signage. This is the Dirty Dicks track. It takes you past various mining works, and is marked by grey posts.

As the works around the wheel and on Dirty Dick’s track are completed, we are assuming that this track away from the wheel will be more clearly signposted.

The works around the Wheel are part of a project to improve access to the Welsh Village. So far, they’re looking good. We have hopes that before they’re finished, Parks will have eliminated the Bridal Creeper infestations in the precinct.

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Roadside riddles

Mount Alexander shire conducted three poorly advertised consultation sessions through June and July on its draft Roadside fuel and bushfire risk strategy.

The draft document can be found online here

The draft, prepared by Fire Risk Consultants, proposes ‘treatment’ of roadsides to reduce bushfire risk. ‘Treatment’ includes slashing, burning, grazing, and ‘dangerous tree mitigation’.

Local roadside. It’s more likely to be hit by a cigarette butt than a lightning strike. Respecting the biodiversity values of roadsides while managing them as fire risks is a challenge. And the fire risk can’t be managed without serious attention to human behaviour. 

Importantly, we read on page 4 of the draft that ‘This report only deals with the part of the project related to bushfire risk in the local area and the assessments. A separate study on ecological values on the target roadsides and identification of values to be protected has been undertaken as a separate piece of work.’

The ecological study will be used in conjunction with the risk document to govern Shire policy on roadsides. And therein lies the challenge: the risk draft identifies ‘surface fine fuels’ as a fire danger. As we know, these can also be considered as essential to ecological health. Balancing these two judgments has never seemed to be easy.

One peculiarity of the  draft: on page 8 we read, ‘A variety of causes can ignite a bushfire: some bushfires result from events that are natural, such as lightning, while others result from human activity.’

Get it? ‘Some’ fires are natural; ‘others’ are the result of ‘human activity’. Maybe we’re sensitive, but this bland statement seems to radically downplay the ‘human activity’ side of the problem.

Here’s a bald fact: repeated analyses have shown that about 6% of fires are ‘natural’. The rest—over 90% —  are the result of human carelessness, accident or criminality. Tossed cigarette butts alone account for about 7% of fires! Try googling ‘cigarettes and fire’, and you’ll quickly enter a chamber of horrors.

Any policy dealing with roadsides should have these facts firmly in mind. Ignoring them, or downplaying them, might look like carelessness.

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State of the environment: I don’t need to change, do I?

Australia’s State of the Environment report 2021 was belatedly released last week. The report’s grim findings have been widely publicised, and we won’t repeat what will be already widely known. It’s worth pointing out, however, that the report is peppered with words and phrases emphasising the need for ‘greater community awareness’, to ‘rethink’, ‘redesign’, ‘be more conscious’, ‘to build better, greener, more resilient’. This is in line with virtually every other Enviro report we’ve seen: the need to change the way we live is pretty basic. Maybe that’s why such reports are political dynamite.  Everyone wants a better environment. How many want the changes necessary to bring that about?

An example of ‘disregard’ for environmental values? Gazanias for sale: ‘Gazania (Gazania linearis) is regarded as an environmental weed in Victoria, Tasmania and South Australia and as an emerging or potential environmental weed in parts of Western Australia and New South Wales. This species invades coastal habitats, as well as grasslands and open woodlands in inland areas. It can severely alter the vegetation structure in plant communities by replacing and suppressing native plants.’ –Lucid Central.

Coincidentally, the North Central Catchment Management Authority has released its Regional Catchment strategy 2021-27. This document contains the following blunt statement: ‘A general lack of understanding or regard for legislation designed to protect biodiversity, as well as cultural heritage,  has been identified as a concern across the region’(our emphasis).

How can this ‘general lack of understanding or regard’ be changed? This strategy underlines the importance of engagement with ‘Rural landholders, associated community-based NRM groups, volunteers and the broader community…government, non-government, industry and research organisations’ (our emphasis), but isn’t very specific about how this engagement might happen.

On this one, we have a modest idea: more Park Rangers circulating in our protected areas, engaging face to face with holiday makers and travellers, cheerfully and passionately promoting the values of biodiversity? Oh, that would cost money…Maybe a reduction in the number of moronic TV campaigns promoting silly and destructive attitudes to the environment? That would be cheap.

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State of the environment 2: some fun snippets

Here are a few details from the SOE report, relevant to our own region:

1. Paying attention to good on ground management matters.

If you ever wonder whether Landcare is worth the effort, or if weed and feral animal control matters, check this table:

 

2. Amazing news—it’s getting dryer!

‘Infrastructure Australia’s 2019 audit found that the reduction in average winter rainfall in south-western Australia has caused a 50% reduction in urban run-off over the past 50 years, leading to declining streamflows across the southern and south-eastern regions.’

3. Urban design matters, and so does the greening of our towns and cities

‘Because of the increasing ratio of building area to land area on lots, the space for trees, plants and outdoor recreation at both the front and rear of dwellings has declined. This change in urban form is not only changing the physical form and character of existing and greenfield neighbourhoods, but the ability to manage heat, improve walkability and thereby the livability or our urban environments. It is also reducing the extent of urban biodiversity by decreasing tree canopy cover and garden space… Research has found that private sector residential development in the past 20 years has less tree cover than in previous decades…

‘… To manage urban heat and increase our safety and wellbeing, we will be looking to re-establish more natural environments within our urban environment, empower Indigenous peoples and their knowledge, create new programs of tree planting, reintroduce biodiversity, renaturalise our waterways and use biomaterials to construct our built environment. This must occur concurrent with our reduction in energy consumption and as we reconnect our green and blue urban infrastructure into a quality network for people and urban biodiversity.’

  1. Guess what: offsets may not be such a great idea…

‘The growing dependency on offsets to protect matters of national environmental significance from the impacts of development is risky, given the lack of demonstrated successful outcomes, and inadequate monitoring and oversight.’ [FOBIF emphasis]

  1. Settling people in fire prone environments has big consequences

‘In a post-pandemic digital era, modern settlement patterns are likely to proliferate across rural and regional Australia as more people are less tied to working in large cities … Managing a more distributed network of people with exacerbated fire weather across whole landscapes is likely to have significant negative consequences for vulnerable biodiversity and ecosystems, with flow-on impacts to natural capital and diminished resilience of local communities. Local communities will need to revisit the objectives of their fire management strategies to balance the potential human impacts with natural capital values they wish to maintain.’

  1. Way to go: indigenous solutions

An interesting feature of this report is its heavy emphasis on the need to pay attention to indigenous ways of thinking and managing. It is extremely positive about the increasing engagement of indigenous people in land management, but offers the following sober reality check:

‘Indigenous people are rich in land assets and poor in terms of access to finance and other critical support to manage Country. The Indigenous estate has grown through native title determinations and other means. However, recognition of Indigenous ownership or land-use agreements does not automatically translate to Traditional Custodians accessing, actively managing and realising wellbeing and economic benefits from their lands.’

  1. And here’s a provocative claim

‘Historically, planning regulations have put the protection of people first, the protection of assets second and the protection of the environment third. This has downplayed the wellbeing implications of connections between people and the environment, which has particular implications for Indigenous people’s connections to Country.’

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State of the environment 3: this fact isn’t so fun

‘Species introduced to Australia from other regions and countries can have a crippling effect on economies and further impact the health and wellbeing of local communities. The cost to Australia of managing problem species over the past 50 years is in the order of hundreds of billions of dollars. These costs are borne both by the economy and the environment…

Bridal Creeper and Blackberry infestation on the Vaughan to Glenluce water race track, July 2022. Infestation along this stretch of the Loddon has doubled in size in 12 months.

‘There are 2,383 introduced species with at least one occurrence record in the Atlas of Living Australia based on observations up to and including 2020 (Table 9). The actual number of introduced species in Australia is expected to be much higher, because many occurrence datasets are not publicly available due to sensitivities, or are not aggregated in one place. For example, there are known to be more introduced plant species (27,500) in Australia than native species, of which around 2,800 have naturalised . As a general rule, around 10% of those that have naturalised in the wild are thought to become impactful invasive species.’

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