|ID||Michel: 1145-1148 Scott: 1538-1541 Stanley Gibbons: 1536-1539 Yvert: 1026-1029 UPU: N/A Category: pF|
|Author||Leonard E. Buckley|
|Stamps in set||4|
|Size (width x height)|
|Layout||192 stamps per sheet - 4 x 48|
|Print Technique||Lithographed and engraved, multicolor|
|Printed by||Bureau of Engraving and Printing|
|Issuing Authority||U.S. Postal Service|
Araucarioxylon arizonicum is an extinct species of conifer that is the state fossil of Arizona. The species is known from massive tree trunks that weather out of the Chinle Formation in desert badlands of northern Arizona and adjacent New Mexico, most notably in the 378.51 square kilometres (93,530 acres) Petrified Forest National Park. There, these trunks are locally so abundant that they have been used as building materials.
In the Triassic period (around 250 to 200 million years ago), Arizona was a flat tropical expanse in the northwest corner of the supercontinent Pangaea. There, a forest grew in which Araucarioxylon arizonicum towered as high as 60 metres (200 ft) and measured more than 60 centimetres (2.0 ft) in diameter. Fossils frequently show boreholes of insect larvae, possibly beetles similar to members of the modern family Anobiidae.
Other stamps of the set
|Souvenir Sheet||Used FDC|
Latest update 11.01.2018
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