Glen Canyon Natural History - Revision history

Ccarlsson: added bike tour video

2023-04-26T04:23:32Z

added bike tour video

← Older revision		Revision as of 21:23, 25 April 2023
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	''by Pete Holloran''		''by Pete Holloran''

			<iframe src="https://archive.org/embed/natural-areas-and-native-plants-apr-23-2023" width="640" height="480" frameborder="0" webkitallowfullscreen="true" mozallowfullscreen="true" allowfullscreen></iframe>

			A bike tour on Saturday, April 23, 2023, starting at Glen Park Greenway and visiting Glen Canyon's grasslands, its western edges along O'Shaughnessy Drive, the Native Plant garden at the Miraloma Park Improvement Association parking lot, the Twin Peaks slopes, and ending finally at Mt. Sutro Open Space. Led by the SF Department of the Environment's Peter Brastow and California Native Plant Society aficionado Bob Hall, this was an incredible journey through habitats and species, mostly plant, during the super bloom after our rainy winter. Lots of science and information!


	[[Image:glenpark$glen-canyon-rocks.jpg]]		[[Image:glenpark$glen-canyon-rocks.jpg]]

Ccarlsson: moving photo to new page

2022-11-28T04:07:12Z

moving photo to new page

← Older revision		Revision as of 21:07, 27 November 2022
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	In Glen Canyon, the San Francisco forktail damselfly is largely restricted to a drainage ditch on the northern slope. It has gone extinct at least once in the canyon, but graduate students from San Francisco State University reintroduced it from nearby populations on [[San Bruno Mountain\|San Bruno Mountain]].		In Glen Canyon, the San Francisco forktail damselfly is largely restricted to a drainage ditch on the northern slope. It has gone extinct at least once in the canyon, but graduate students from San Francisco State University reintroduced it from nearby populations on [[San Bruno Mountain\|San Bruno Mountain]].

	~~[[Image:Sf-eagle-eating-pigeon.jpg]]~~

	~~'''Thanksgiving Bird!: This young red-tailed hawk is munching a pigeon right outside the window of an apartment at 19th and Dolores, on Thanksgiving Day, 2003.'''~~

	~~''Photo: Tristan Savatier''~~

	The Friends of Glen Canyon Park is particularly active in providing stewardship to the canyons wildlands. Its members are occasionally seen in the canyon with spotting scopes trained on the red-tailed hawk nests in the eucalyptus trees above. They often know to the day when the years chicks fledged!		The Friends of Glen Canyon Park is particularly active in providing stewardship to the canyons wildlands. Its members are occasionally seen in the canyon with spotting scopes trained on the red-tailed hawk nests in the eucalyptus trees above. They often know to the day when the years chicks fledged!

Ccarlsson at 01:37, 6 May 2020

2020-05-06T01:37:52Z

← Older revision		Revision as of 18:37, 5 May 2020
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	The Friends of Glen Canyon Park is particularly active in providing stewardship to the canyons wildlands. Its members are occasionally seen in the canyon with spotting scopes trained on the red-tailed hawk nests in the eucalyptus trees above. They often know to the day when the years chicks fledged!		The Friends of Glen Canyon Park is particularly active in providing stewardship to the canyons wildlands. Its members are occasionally seen in the canyon with spotting scopes trained on the red-tailed hawk nests in the eucalyptus trees above. They often know to the day when the years chicks fledged!

			[[Image:Elise Beneke Tietz with cow in Glen Canyon c1909 AAD-2705.jpg]]

			'''Elise Beneke Tietz with a cow in Glen Canyon, c. 1909.'''

			''Photo: San Francisco History Center, San Francisco Public Library''

	<hr>		<hr>
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	[[Category:Glen Park]] [[Category:Glen Canyon]] [[category:habitat]] [[category:parks]] [[category:species]] [[category:water]]		[[Category:Glen Park]] [[Category:Glen Canyon]] [[category:habitat]] [[category:parks]] [[category:species]] [[category:water]] [[category:1900s]] [[category:2000s]]

Ccarlsson: added photo

2017-03-27T20:35:35Z

added photo

← Older revision		Revision as of 13:35, 27 March 2017
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	''Photo: Chris Carlsson''		''Photo: Chris Carlsson''

			[[Image:Glen-Canyon-before-trees wnp14.jpg]]

			'''Glen Canyon at turn of 20th century, before trees planting.'''

			''Photo: [http://www.opensfhistory.org Western Neighborhoods Project/OpenSFHistory.org]''

	[[Image:Islais-creek-near-source-in-glen-canyon7143.jpg]]		[[Image:Islais-creek-near-source-in-glen-canyon7143.jpg]]

Ccarlsson: added new photo

2016-10-20T19:28:48Z

added new photo

← Older revision		Revision as of 12:28, 20 October 2016
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	'''Islais Creek near its source at the top of Glen Canyon, 2006.'''		'''Islais Creek near its source at the top of Glen Canyon, 2006.'''

			''Photo: Chris Carlsson''

			[[Image:Islais-Creek 20160911 181526.jpg]]

			'''Islais Creek flowing in mid-canyon during late summer 2016 in a very dry period.'''

	''Photo: Chris Carlsson''		''Photo: Chris Carlsson''

Ccarlsson: fixed navigation for new page

2011-01-04T05:11:16Z

fixed navigation for new page

← Older revision		Revision as of 22:11, 3 January 2011
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	[[Image:Tours-habitat.gif\|link=McLaren Park]] [[McLaren Park \| Continue Habitat/Species Tour]]		[[Image:Tours-habitat.gif\|link=McLaren Park]] [[McLaren Park \| Continue Habitat/Species Tour]]

	[[~~Glen Canyon Park~~ \| Prev. Document]] [[Glen Park: SF's 'Little Switzerland' \| Next Document]]		[[Giant Powder Company \| Prev. Document]] [[Glen Park: SF's 'Little Switzerland' \| Next Document]]


	[[Category:Glen Park]] [[Category:Glen Canyon]] [[category:habitat]] [[category:parks]] [[category:species]] [[category:water]]		[[Category:Glen Park]] [[Category:Glen Canyon]] [[category:habitat]] [[category:parks]] [[category:species]] [[category:water]]

Texteradmin at 05:16, 21 August 2009

2009-08-21T05:16:11Z

← Older revision		Revision as of 22:16, 20 August 2009
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	<hr>		<hr>

	[[Image:Tours-habitat.gif]] [[McLaren Park \| Continue Habitat/Species Tour]]		[[Image:Tours-habitat.gif\|link=McLaren Park]] [[McLaren Park \| Continue Habitat/Species Tour]]

	[[Glen Canyon Park \| Prev. Document]] [[Glen Park: SF's 'Little Switzerland' \| Next Document]]		[[Glen Canyon Park \| Prev. Document]] [[Glen Park: SF's 'Little Switzerland' \| Next Document]]

Texteradmin at 05:01, 20 August 2009

2009-08-20T05:01:56Z

← Older revision		Revision as of 22:01, 19 August 2009
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	The Friends of Glen Canyon Park is particularly active in providing stewardship to the canyons wildlands. Its members are occasionally seen in the canyon with spotting scopes trained on the red-tailed hawk nests in the eucalyptus trees above. They often know to the day when the years chicks fledged!		The Friends of Glen Canyon Park is particularly active in providing stewardship to the canyons wildlands. Its members are occasionally seen in the canyon with spotting scopes trained on the red-tailed hawk nests in the eucalyptus trees above. They often know to the day when the years chicks fledged!

	[[Image:~~Habitat-tour~~-~~button~~.~~jpg~~]] [[McLaren Park \|~~-->~~ Habitat/Species Tour ~~continues~~]]		<hr>

			[[Image:Tours-habitat.gif]] [[McLaren Park \| Continue Habitat/Species Tour]]

	[[Glen Canyon Park \| Prev. Document]] [[Glen Park: SF's 'Little Switzerland' \| Next Document]]		[[Glen Canyon Park \| Prev. Document]] [[Glen Park: SF's 'Little Switzerland' \| Next Document]]

Ccarlsson: Protected "Glen Canyon Natural History": finished essay [edit=sysop:move=sysop]

2009-01-07T05:35:48Z

Protected "Glen Canyon Natural History": finished essay [edit=sysop:move=sysop]

← Older revision	Revision as of 22:35, 6 January 2009
(No difference)

Lisaruth: changed islais creek link

2009-01-04T23:05:03Z

changed islais creek link

← Older revision		Revision as of 16:05, 4 January 2009
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	''Photo: Chris Carlsson''		''Photo: Chris Carlsson''

	Glen Canyon's varied topography and diverse habitats make it one of the most interesting natural areas left in San Francisco. The cliffs carved above bear witness to the active seismic activity in the ancient past. Along O'Shaughnessy Boulevard the dark-red outcrops of Franciscan radiolarian chert, deposited long ago in perfectly flat beds on an ocean floor, have been warped over time into folded chevrons. Bluff lettuce (''Dudleya farinosa''), stonecrop (''Sedum spathulifolium'') and other denizens of rocky outcrops grip the cliff face. A gnarled chinquapin (''Chrysolepis chrysophylla''), the only one in San Francisco, clutches a windswept rock. In a patch of brush high above the road, the common scarlet columbine (''Aquilegia formosa'') was just barely hanging on, down to just these couple of individuals in the entire county. With help from the park's volunteer stewards, it now flourishes along the north fork of Islais Creek in the canyon below. Before entering a culvert near the Recreation Center, [[Islais Creek ~~1918~~\|Islais Creek]] runs unhindered through willow woodlands and planted eucalyptus trees. It thereby joins [[Water in the Presidio\|Lobos Creek]] as the only other above-ground creek in San Francisco.		Glen Canyon's varied topography and diverse habitats make it one of the most interesting natural areas left in San Francisco. The cliffs carved above bear witness to the active seismic activity in the ancient past. Along O'Shaughnessy Boulevard the dark-red outcrops of Franciscan radiolarian chert, deposited long ago in perfectly flat beds on an ocean floor, have been warped over time into folded chevrons. Bluff lettuce (''Dudleya farinosa''), stonecrop (''Sedum spathulifolium'') and other denizens of rocky outcrops grip the cliff face. A gnarled chinquapin (''Chrysolepis chrysophylla''), the only one in San Francisco, clutches a windswept rock. In a patch of brush high above the road, the common scarlet columbine (''Aquilegia formosa'') was just barely hanging on, down to just these couple of individuals in the entire county. With help from the park's volunteer stewards, it now flourishes along the north fork of Islais Creek in the canyon below. Before entering a culvert near the Recreation Center, [[Islais Creek Remembered\|Islais Creek]] runs unhindered through willow woodlands and planted eucalyptus trees. It thereby joins [[Water in the Presidio\|Lobos Creek]] as the only other above-ground creek in San Francisco.

	'''The diverse habitats in the canyon make it particularly important for wildlife.'''		'''The diverse habitats in the canyon make it particularly important for wildlife.'''