Reminder: FOBIF AGM next Monday (September 12)

The Annual General Meeting of Friends of the Box-Ironbark Forests will be held in the Ray Bradfield Room at 7.30 next Monday. This meeting room is in Victory Park, Castlemaine with access from the IGA carpark or Mostyn Street. The guest speaker will be Patrick Kavanagh on the topic of Photographing Nature. Everyone is welcome and refreshments will be provided. Check our earlier post for more details.

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Get in on the ground storey

Interested in digging a bit deeper into the ‘problem’ of leaf litter?

Remember: it’s the stuff which is a fire risk, and should be cleaned up…or it’s the stuff which keeps moisture in the soil, and prevents erosion…or maybe it’s both?

You might want to delve into this question by checking out The Ground Storey, a little book published by Goulburn Broken CMA. You can find it online here.

The book is directed at property owners, and has practical info on the importance of leaf litter for biodiversity–and how to manage it to reduce fire risk.

In Sebastopol Gully: that stuff lying on the ground isn’t rubbish. It’s biodiversity heaven.

Interestingly, the book takes up the challenge put by the NSW Threatened Species Scientific Committee:

‘Clearing of leaf litter and fallen logs, often associated with clearing and/or burning of the understorey for clearing, removes habitat for a wide variety of vertebrates and invertebrates which live in the leaf litter and in the fallen logs – including reptiles, small mammals, invertebrates, for example, spiders, molluscs, millipedes, ants etc. These impacts may affect ecological functioning. Loss of the leaf litter also exposes bare soil which will be susceptible to soil erosion and drying, and hence affects the soil biota, and may make sites more vulnerable to weed invasion.’

In other words, leaf litter has a value: it should not be thoughtlessly removed. The Goulburn-Broken book carries some eloquent info on this theme.

And the fire risk? Check chapter 7 in the book.

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Water and wattle

Despite the damp weather lately it is rather nice out in the bush if you like water or wattle or preferably both.

The photos are around Tarilta Creek and the two well known and lesser known falls there which are usually dry, taken last Tuesday (23rd August).

 

Photos by Jeremy Holland.

 

 

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A stroll through the Metcalfe NCR

Good numbers rocked up for FOBIF’s August walk through the Metalfe Nature Conservation Reserve yesterday. This small reserve features beautiful open valleys of grassy woodland, the understorey dominated by Wallaby Grass.

Part of FOBIF’s walking group in the reserve, which features quiet open grassy valleys.

The reserve, unusually for this region, carries no Stringybarks, giving it quite a distinctive appearance, especially given the large number of unusually old Long-leaf Box eucalypts. Leaders Barb Guerin and Lionel Jenkins organised a stimulating route through some idyllic valleys before ending in a stroll along the high ridge which bisects the reserve, with glimpses of fine views across to the west. They also cleverly arranged excellent walking weather, brisk with great patches of bright sunshine. There’s an abundance of Hovea in flower, and although the fungi season is ‘over’, there was enough around to keep the eyes to the ground.

Our thanks to Barb and Lionel for a great stroll through a perhaps under appreciated gem of a reserve. Next month’s walk is in the Muckleford forest. Check the program for details.

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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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