ALVAREZ, Walter (1940 – )

1940 –

2 entries in the GMN corpus.

Image source Orangeboxes2 · Own work · CC0

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1979 CE

#14206

Experimental evidence in support of an extra-terrestrial trigger for the Cretaceous-Tertiary extinctions. (Abstract).

ALVAREZ, Luis Walter (1911 – 1988)

ALVAREZ, Walter (1940 – ) ASARO, Frank (1927 – 2014) MICHEL, Helen Vaughan (1932 – )

Iridium is a very rare element in the Earth's crust, but is found in anomalously high concentrations (around 1000 times greater than normal) in a thin worldwide layer of clay marking the boundary between the Cretaceou…

1980 CE

#14207

Extraterrestrial cause for the Cretaceous-Tertiary extinction.

ALVAREZ, Luis Walter (1911 – 1988)

ALVAREZ, Walter (1940 – ) ASARO, Frank (1927 – 2014) MICHEL, Helen Vaughan (1932 – )

Following up on No. 14206, the authors stated that the same excess iridium areas were found in two different areas of W. Europe and in New Zealand, and posited that “the anomalous iridium concentrations at the C…