Pg. 2060-2061. Hook Limestone member of Macy formation. Name applied to lower member of formation. Composed of yellowish-brown fucoidal, fine calcitite with irregular buff-weathering dolomitic partings, and layers of intraformational conglomerate. Thickness at type locality 55 feet; here contains a 6-inch bed of orange metabentonite at 27 feet and a 1-inch bed of metabentonite at 46 feet; generally thins northward; thickens southward to 69 feet in Perry County. Underlies Zell member (new); overlies Hagar formation (new). Recognized in southeastern Missouri. Age is Middle Ordovician.
Type exposure: Along Missouri Highway 25 [US Hwy. 61], east of Macy, Ste. Genevieve Co., MO.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1799).

Pg. 111 (fig. 68), 115 (fig. 69), 121 (fig. 72), 126, 127, 131 (fig. 78), 133, 143 (fig. 86), 165 (fig. 103), 167 (fig. 104), 168, 169-171, 176 (fig. 109). Hook Member of Macy Limestone of Plattin Group. Lithologically similar to Beckett Limestone and is "typical Plattin." Is light-gray to gray, burrowed nodular mudstone interbedded with thin beds of unborrowed fine to medium grainstone. Minor amounts of chert scattered throughout. Hook and Zell members appear to be distinctive units in most of east-central and southeastern Missouri. Hook separated from Zell by very sharp contact. Includes a prominent K-bentonite bed. Age is Mohawkian. History of nomenclature, type section stated, reference sections designated, measured sections, photographs of outcrops, correlation charts.
Reference sections: (1) well exposed on I-55 in roadcuts beginning 0.5 mi north of the bridge over Joachim Creek and extending to the intersection with Jefferson Co. Rd. M at Barnhart, Herculaneum 7.5-min quadrangle; (2) in a roadcut on the north frontage road to I-44 west of the Allenton-Six Flags exit, western St. Louis Co., Eureka 7.5-min quadrangle; (3) in roadcut on Missouri Hwy. 30 at Weber Hill, NE/4 sec. 27, T. 43 N., R. 4 E., Jefferson Co., House Springs 7.5-min quadrangle.

Source: Publication.

Pg. 34. Hook Member of Macy Limestone of Plattin Group [in Missouri]. The Hook Member of the Macy Limestone is much like the underlying Beckett Limestone. Burrowing is predominately vertical and unoriented. Age is Mohawkian.

Source: Publication.

Pg. 135. Hook Member of Macy Limestone of Plattin Group. "Type section: Larson (1951, p. 2060) named the lower member of the Macy Limestone, the Hook Member, from a roadcut on U.S. Hwy 61 [MO Hwy 25], SE NE SE 28, 38N-8E, Ste. Genevieve County, Missouri. This is also the type section for the overlying Zell Member. This name, proposed by Larson (1951), was rejuvenated by Thompson (1991), who adopted Larson's subdivision of the Plattin Group for the southeastern Missouri succession. It can be distinguished from the overlying Zell Member in that its burrowing is predominantly vertical or unoriented, whereas burrowing in the Zell is predominantly horizontal. The Hook Member overlies the Victory Member of the Hager Limestone." Age is Mohawkian.

Source: Publication.