July Outing Report - Muntapa Tunnel and the Palms National Park, Cooyar, Sunday 06 July 2025.

  Adapted from the TFNC newsletter report of M.Simmons

Rhyolite blocks and tuff

Our day was designed to drive the Oakey-Cooyar Road through the localities of Wilthorn, Sabine, Sugarloaf, Beith, Acland, Muldu, Balgowan, Plainview, Rosalie Plains, Kulpi, Peranga and Narko before reaching the Muntapa Tunnel – all were sidings along the Oakey-Cooyar railway line built in 1911 to carry timber and other primary produce to the coast. A brief roadside pull-over atop a hill enabled a view over the current workings of the Acland coal mine.

In the Muntapa picnic area we were given interesting little stories and information on the geological formation of the surrounding rocks and topography. ‘About 18 million years ago [this area] was subject to complex and violent volcanism where rising rhyolitic magmas superheated groundwater resulting in huge phreatic explosions. Craters between 100 and 200 metres deep were infilled with masses of material fallen from the sky. Both portals [of the tunnel] will show us the variety of this material – through which those who had constructed the tunnel had worked with hand tools.’ 

The tunnel has now been fenced giving a Gothic-like appearance through to the roosting and breeding colony of several thousand Bent-wing Bats, Miniopterus schreibersii. These bats cluster tightly together (up to 1,500 per square metre) on the ceilings of caves, mines, disused railway tunnels, storm water drains and old cement buildings. (‘Bats of Eastern Australia’ Qld Museum booklet No.12).  The historical markers and information recording the  history of the tunnel, the workers campsite and associated memories of long-term residents all added to making this a worthy revisit for the Nats.                                                                        

Black Bean Castanospermum australe 
pods at The Palms N.P.

Further north beyond Cooyar in the Palms National Park we walked the short track through Piccabeen Palms, Strangler Figs, Bunya and Hoop Pines and an ancient Grey Gum – over 300 years old through which flows a spring fed gully in the headwaters of the Brisbane River. 

Bird list for July outing.  (Muntapa Tunnel and Palms Nat. Park compiled by L. Moodie.)

Oakey Rotary Park: Pacific Black Duck, Australian Pelican, Australian White Ibis, Little Corella, Noisy Miner, Grey Butcherbird, Australian Magpie, Magpie-lark. 

Muntapa Tunnel:  Red-backed Fairy-wren, Lewin’s Honeyeater, Yellow-faced Honeyeater, Noisy Miner, Spotted Pardalote, Speckled Warbler, Brown Thornbill, Varied Sittella, Grey Shrike-thrush, Pied Currawong, Australian Magpie, Grey Butcherbird, Grey Fantail, Torresian Crow, Silvereye, Red-browed Finch.

Palms National Park: Australian Brush-turkey, Brown Quail, Laughing Kookaburra, White-throated Treecreeper, Lewin’s Honeyeater, Spotted Pardalote, Brown Gerygone, White-browed Scrubwren, Golden Whistler, Eastern Whipbird, Grey Fantail, Eastern Yellow Robin.