DEFORMED MARINE TERRACES ON SANTA CATALINA ISLAND, CALIFORNIA: NEW MEASUREMENTS FROM TERRACE-PLATFORM SURFACES AND PHOLAD-BORED CLASTS

2020 ◽  
Author(s):  
Margarita E. McInnis ◽  
◽  
Nicholas Pinter
Keyword(s):  
Marine Terraces ◽  
Santa Catalina Island

Marine terraces on Santa Catalina Island

1933 ◽  
Vol s5-25 (146) ◽  
pp. 123-136 ◽  
Author(s):  
W. S. T. Smith
Keyword(s):  
Marine Terraces ◽  
Santa Catalina Island

Uplifted marine terraces on Santa Catalina Island, California, USA

Geology ◽  
2021 ◽  
Author(s):  
Margarita McInnis ◽  
Nicholas Pinter
Keyword(s):  
Narrow Band ◽  
The Other ◽  
Channel Islands ◽  
Marine Origin ◽  
Marine Terraces ◽  
California Channel Islands ◽  
Santa Catalina Island ◽  
Harbor Area

Marine terraces are widespread along California’s coastline, including on all of the Channel Islands, with the possible exception of Santa Catalina. For over a century, the origins of subhorizontal surfaces and gravel deposits on Santa Catalina have been debated, with recent suggestions that Santa Catalina has no marine terraces and is subsiding. We mapped, measured, and described terrace deposits on Santa Catalina Island, including both in situ deposits and distributed gravel float. Rounded gravels and cobbles, locally pholad-bored, are present as float across low-relief surfaces in the Little Harbor area. We also mapped and described the Eagles Nest Gravels, an ~8-m-thick package overlying a broad bedrock-cut platform at ~200 m elevation and dipping 3.2° northward. The Eagles Nest Gravels contain rounded cobbles and boulders, many of which contain pholad borings. Two other platforms are inferred from concordant gravels with similar orientations but at lower elevations. Terrace deposits on Santa Catalina truncate underlying lithological units, including a narrow band of fossiliferous Miocene to Pliocene sands. Terrace deposits and gravel lag on Santa Catalina closely resemble older terrace deposits on other California Channel Islands. The terraces on Santa Catalina Island remain undated but document at least 200 m of net uplift, similar to the elevations of undated terraces on the other Channel Islands. While the timing of uplift of Santa Catalina is unclear, analysis of terrace deposits in the Little Harbor area confirms their marine origin and settles the debate regarding the presence of marine terraces on Santa Catalina Island.

Tectonic influences on the preservation of marine terraces: Old and new evidence from Santa Catalina Island, California

Geomorphology ◽  
2012 ◽  
Vol 179 ◽  
pp. 208-224 ◽  
Author(s):  
R. Randall Schumann ◽  
Scott A. Minor ◽  
Daniel R. Muhs ◽  
Lindsey T. Groves ◽  
John P. McGeehin
Keyword(s):  
Marine Terraces ◽  
Santa Catalina Island ◽  
New Evidence

scholarly journals Uplifted marine terraces on Santa Catalina Island, California, USA: COMMENT

Geology ◽  
2021 ◽  
Vol 49 (7) ◽  
pp. e529-e529
Author(s):  
Chris M. Castillo ◽  
Simon L. Klemperer
Keyword(s):  
Marine Terraces ◽  
Santa Catalina Island
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