Data from: Camerate crinoids from the Nunn Member (Osagean) of the Lower Mississippian Lake Valley Formation, New Mexico

The Nunn Member (Early Osagean) of the Lake Valley Formation of New Mexico is known for its abundance and diversity of crinoids. Although crinoids were first reported in the late 1800's, there has not been a comprehensive study of the crinoids, and a complete list of the crinoid taxa does not exist. All subclasses of crinoids occur in the Lake Valley, but the camerates are by far the dominant group. Study of the Macurda collection from the University of Michigan, the Laudon collection from the University of New Mexico, and new collections provided more than 7000 specimens, 4,500 of which were identifiable camerates. Sixty-one species of camerates are recognized in the Nunn Member, including five new species: Blairocrinus macurdai, Iotacrinus novamexicanus, Agaricocrinus alamogordoensis, Uperocrinus kuesi, and Collicrinus laudoni. This camerate fauna is very similar to that of the lower Burlington Limestone of the Mississippi Valley. An update of the crinoid taxa in the Lake Valley Formation allows for a better understanding of the temporal and geographic relationships of crinoid faunas across North American during the Early Mississippian when camerates were at their global diversity maximum. The majority of the camerates come from the western New Mexico outcrops where the Nunn is thicker and the marine shelf was shallower, but several also occur in association with the deep-water Waulsortian mounds.

新墨西哥州湖谷组（Lake Valley Formation）的纳恩段（Nunn Member，早奥塞阶）以海百合类（crinoids）的丰富度和多样性而闻名。尽管海百合类早在19世纪晚期就已有报道，但此前尚未开展针对该类群的综合性研究，也不存在完整的海百合类分类单元名录。湖谷组产出海百合类的所有亚纲类群，但板海百合类（camerates）为绝对优势类群。通过对密歇根大学Macurda藏品、新墨西哥大学Laudon藏品以及新采集标本的研究，共获得7000余件标本，其中4500件为可鉴定的板海百合类标本。在纳恩段中已识别出61种板海百合类，其中包含5个新种：*Blairocrinus macurdai*、*Iotacrinus novamexicanus*、*Agaricocrinus alamogordoensis*、*Uperocrinus kuesi* 及 *Collicrinus laudoni*。该板海百合动物群与密西西比河谷下伯灵顿灰岩的板海百合动物群极为相似。本次对湖谷组海百合类分类单元的修订，有助于更深入地理解早密西西比世时期北美地区海百合动物群的时空分布关系——彼时板海百合类的全球多样性达到峰值。绝大多数板海百合类标本产自新墨西哥州西部的露头区域，该区域的纳恩段地层厚度更大，古陆架水体更浅；但也有部分标本与深水沃索蒂安丘（Waulsortian mounds）伴生产出。