He is known for his work in mapping the island of South Georgia and for surveying the geology of Western Australia.
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Trendall was the geologist on the 1951-52 and 1953-54 South Georgia Survey expeditions led by Duncan Carse.
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Trendall Crag, 1,005 m, overlooking the north side of Drygalski Fjord at the southeast end of South Georgia, was named to commemorate Alec Trendall's contribution.
The first expedition consisted of six men: Carse, deputy leader Kevin Walton, the surveyors Gordon Smillie and John Heaney, the geologist Alec Trendall, and the mountaineer Walter Roots.
Alec Guinness | Alec Baldwin | Alec Douglas-Home | Alec Head | Alec Empire | Alec Stewart | Alec Issigonis | Alec Finn | Alec Ross | Alec Bedser | Alec Thomson | Alec Sulkin | Alec Ross (innovator) | Alec Boswell Timms | George Alec Effinger | Alec Wilder | Alec Trendall | Alec Swann | Alec Stevens | Alec Soth | Alec Sokolow | Alec Roth | Alec Powers | Alec Hanley Bemis | Alec Finlay | Alec Coxon | Trendall Crag | Alec Wilkinson | Alec Tidey | Alec Stone Sweet |