Re[2]: Origma at Capertee

To: <>, <>, <>
Subject: Re[2]: Origma at Capertee
Date: Mon, 12 Oct 98 16:20:35 +1000
     Keith Hindwood wrote the definitive paper covering all aspects of the 
     Rock Warbler Emu ? (will look it up). He also quoted that the Rock 
     Warbler occured on Limestone as well as Sandstone hence records for 
     Rock Warblers at Jenolan Caves and other limestone areas such as 
     Bungonia Gorge etc. Definately a species that should be studied.
     Alan Leishman, Royal Botanic Gardens.

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Subject: Re: Origma at Capertee
Author:  "David Geering"<> at mailgate
Date:    10/12/98 1:43 PM

The story so far:
   John asked about the Origma seen in the Capertee Valley given its 
   supposed restriction to Hawksbury sandstone
   I replied: The Capertee Valley is an "enclosed valley" with 
   exceptionally scenic (Hawksbury) sandstone cliffs around about 90% of 
   the valley.  Rock Warblers are regularly seen near the escarpment with 
   Glen Davis a spot often visited by birdwatchers.  A lady I know has a 
   house at the base of the cliffs and a pair nests each year in her 
   garage.  Munghorn Gap, about 85km to the north, is the excepted northern 
   limit while they also occur at Badger Ground (north of Rylstone) 
   north-west of the Capertee Valley.  For the distribution of NSW birds I 
   wholeheartedly recommend the book by Morris, McGill & Holmes (title not 
   at hand) put out by the NSW FOC (I think) which details range limits of 
   all NSW birds.  I hope this satisfies your curiosity.
   John thanks me and remarked that he wasn't aware that Hawksbury 
   Sandstone was so extensive.
   Not knowing when to leave good enough alone I replied:  If we were to be 
   geologically correct I'm fairly certain the "Hawksbury" sandstone does 
   not extend that far.  Origma's, I think, occur on what is collectively 
   known as the Sydney Basin sandstones, which is a collection of 
   sandstones including Hawskbury Sandstone.  Perhaps this is verging on 
   the pedantic but it means that your initial question was a perfectly 
   valid one.
   John replies: I see.  I had wondered, given the prevalence of sandstone 
   and its associated vegetation all up the East Australian coast, why the 
   Rock Warbler, which is
   relatively common in suitable spots in the Sydney area, was so 
   restricted in
   range.  Your advice partly answers this, but only partly, I feel.
It is time to throw open this discussion.  Any birders out there with a 
better geological knowledge of the Sydney basin and the distribution of the 
Origma than I?
David Geering

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