Marker Logo HMdb.org THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Pasadena in Los Angeles County, California — The American West (Pacific Coastal)
 

Throop Memorial Garden

 
 
Throop Garden Marker, Left Panel image. Click for full size.
By Craig Baker, September 29, 2018
1. Throop Garden Marker, Left Panel
Inscription.
Left Panel: This was once the site of Throop Hall, named after the founder of Throop University, Amos G. Throop. Throop University was founded in 1891 and became the California Institute of Technology in 1920. Built in 1910, Throop Hall was the first building on this campus.
The rocks displayed throughout Throop Memorial Garden represent nearly two billion years in the geological history of California. They were brought here from the San Gabriel Mountains, the backdrop to CalTech and Pasadena where Amos G. Throop and his family played an important role.
This exhibit is made possible through the generosity of Martha Vaughan Smith, great-granddaughter of Amos G. Throop.

Right Panel: The boulders in Throop Memorial Garden are grouped according to type and age, given in millions of years. Representative locations for such rocks are also indicated.
I. Rocks numbered 2, 9, 15, 17, 21, 22, 26-29, 34, 35, 39, 49, 52, 55, 57; ancient gray gneisses found on Brown Mountain and at 3,000-4,000 ft. elevations near Angeles Crest Highway; more than 1,700 million years old (MY).
II: Rocks 3, 4, 14, 16, 20, 25, 38, 42, 58, 63-65, 70; oldest generation granite, closely associated with Brown Mountain gneisses; approx. 1,650 MY.
III: Rocks 19, 32, 33, 44, 45, 56, 59, 60, 66; sheared granites, lighter varieties, found on Mt. Lowe, above 4,000 ft; rocks 11, 43, 46; darker varieties, Bear Canyon tributaries; approx. 220 MY.
IV: Rock 37; distinctive pink granite, underlies Echo Mountain, visible on Millard
Throop Garden Marker, Right Panel image. Click for full size.
By Craig Baker, September 29, 2018
2. Throop Garden Marker, Right Panel
Canyon trail; approx. 160 MY.
V: Rocks 6, 12, 21, 24, 31, 53, 61, 62, 67, 69, 71, 72; relatively unsheared granite from Arroyo Seco canyon; 75 to 80 MY.
VI: Rocks 5, 7, 8, 50, 51, 68, 73; distinctive uniform gray granite, underlies Mt. Wilson; 75 MY.
VII: Rocks 36, 47, 48 (light), and rocks 13, 30, 54 (dark); these mysterious rocks were obtained from the Arroyo Seco, but were clearly transported there by Man. Their original sources and ages are unknown.
VIII: Rocks 40, 41; pseudoliths; 12+ years.
 
Location. 34° 8.218′ N, 118° 7.499′ W. Marker is in Pasadena, California, in Los Angeles County. Touch for map. Located on the Cal Tech campus, near Millikan Pond. Marker is at or near this postal address: 1200 E California Blvd, Pasadena CA 91125, United States of America.
 
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies. The First Known Antiparticle (about 300 feet away, measured in a direct line); Iris Garden (about 500 feet away); Beckman pH Meter (approx. 0.2 miles away); Camellia Japonica ‘California’ (approx. 0.9 miles away); Pacific Asia Museum (approx. 1.1 miles away); The Millstones (approx. 1.2 miles away); Pasadena Robinson Memorial (approx. 1.3 miles away); Brainard Alley (approx. 1˝ miles away). Touch for a list and map of all markers in Pasadena.
 
Categories. EducationScience & Medicine
 
Throop Memorial Garden and Markers image. Click for full size.
By Craig Baker, September 29, 2018
3. Throop Memorial Garden and Markers
<i>Exterior, Throop Hall at Cal Tech</i> image. Click for full size.
Photo courtesy of the Los Angeles Public Library
4. Exterior, Throop Hall at Cal Tech
 
 
Credits. This page was last revised on October 6, 2018. This page originally submitted on October 2, 2018, by Craig Baker of Sylmar, California. This page has been viewed 40 times since then. Photos:   1, 2. submitted on October 2, 2018, by Craig Baker of Sylmar, California.   3. submitted on October 3, 2018, by Craig Baker of Sylmar, California.   4. submitted on October 6, 2018, by Andrew Ruppenstein of Sacramento, California. • Andrew Ruppenstein was the editor who published this page.
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