A single terebratulide brachiopod valve found in a middle Eocene limestone deposit in the Humptulips Formation in western Washington State is the first record of a megathyridid brachiopod in a hydrocarbon seep deposit, the first fossil record of the genus Argyrotheca in western North America, and the northernmost record for Argyrotheca from the north-eastern Pacific Ocean.

中文翻译：

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来自美国华盛顿州中始新世Humptulips组中的烃类渗流矿床的巨型甲状腺科（Terebratellidina）腕足类Argyrotheca的首次报道。

在华盛顿州西部Humptulips组中的始新世中部石灰岩矿床中发现了一个单一的terebratulide腕足类动物阀门，这是烃类渗流沉积物中巨型甲状腺类腕足动物的第一个记录，是北美西部Argyrotheca属以及最北端的第一个化石记录。东北太平洋的阿陀螺记录。