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PlaceMT State  Montana  Benchmark City[a] Billings  Prior Tallest Building purpose 1985 Prior Tallest Building PurposeOffice  State Population1132812 Height per State population24.0110450807371 Floors per State population7.32689978566611 Median Expected Height (ft) without geological survey137.404469224865 Median Expected Floors without geological survey41.7969879062887 Shortfall Height (ft) without geological survey-134.595530775135 SHortfall Floors without geological survey-41.2030120937113 Tower Rigatus DescriptorGivetian Tower Profee.me Priority is Profits and Expected Height adjusted for geology WITH OCTOVILLAGESOrder of Batavian Andrew Jackson Vente de Louisiana Tower Fort Benton Memorial Leading Expect Jagphetic Church and Oppidum Target rival City with the worst trafficMissoula Typical hours spent in traffic, 202222 Avg. commute time (minutes)16 Commuters who drive or carpool (%)85.8

America Invented the skyscraper and by 1950 it was 15 of 20 tallest buildings and last year only 3 of 20 tallest buildings and we struck back with a horseburg octovillage stragegy BHSRC ROME with HKC WHITE GEUSWEALTH HOSPITAL AUTHORITY 

Nummulite-like Eocene fossil limestone has not been documented in Montana's geologic record, despite the state hosting well-studied Eocene lacustrine and terrestrial deposits. Montana's Eocene geology is dominated by

igneous activity

in north-central and southwestern regions, with documented fossil assemblages including vertebrates, insects, spiders, and mammals from continental and lacustrine paleoenvironments—settings fundamentally incompatible with the shallow marine conditions required for nummulite accumulation. Nummulites are

common in Eocene to Miocene

marine rocks around the Mediterranean and southwest Asia, making their absence from Montana geologically significant.

Are there any Eocene-aged marine limestone deposits in Montana?

Formation/DepositAge & SettingFossils PresentEnvironmentKishenehn FormationEarly Eocene (46 Ma)Spiders, insects, plants, aquatic molluscs, mammalsLacustrine — tropical freshwaterPipestone SpringsLate Eocene (37.5–36 Ma)Mammals (Chadronian), trace fossils, paleosolsFluvial — volcanic loess depositsBearpaw MountainsEocene (54–50 Ma)Not specified in sourcesIntrusive igneous — no marine settingHighwood MountainsEocene (53–50 Ma)Not specified in sourcesIntrusive igneous — no marine settingMissouri Breaks diatremesEocene (52–47 Ma)Not specified in sourcesIntrusive igneous — no marine setting

🏔️ Montana's Eocene Volcanic & Lacustrine Record

Montana's

Eocene through Early Miocene

sedimentary record reflects continental tectonics and magmatism rather than marine deposition. The state hosts two major Eocene fossil-bearing formations: the Kishenehn Formation and the Pipestone Springs locality, both preserving terrestrial and lacustrine faunas.

• Kishenehn Formation —

  Diverse assemblage of terrestrial arthropods

  , plants, and aquatic molluscs preserved in thinly laminated oil shale; represents a tropical ecosystem at 46 Ma with small insects, spiders, and rare vertebrates

• Pipestone Springs —

  Diverse and abundant assemblage

  of mostly small-bodied middle Chadronian mammals; loessites and paleosols dominate, with newly identified trace fossils likely constructed by dung beetles

• Volcanic magmatism —

  Intrusive igneous activity

  occurred during the Eocene throughout much of north-central Montana in the Bearpaw, Highwood, Little Rocky, and Moccasin Mountains, with activity continuing until 46 Ma

🌍 Why Nummulites Cannot Occur in Montana Eocene Rocks

Nummulites were

lens-shaped foraminifers

that lived exclusively in marine environments and are completely absent from Montana's continental Eocene deposits. Their presence or absence is geologically diagnostic of paleoenvironmental conditions.

• Geographic restriction —

  Particularly prominent in limestone of the Sahara

  and Mediterranean regions; no Tethyan seaway penetrated the North American interior during the Eocene

• Ecological requirement — Nummulites required shallow marine shelf and platform settings with open ocean connectivity; Montana's Eocene basins were isolated continental depressions with fluvial, lacustrine, and volcanic conditions

• Index fossil utility —

  Very abundant, easy to recognize

  , and lived in certain biozones, making them useful guide fossils—but only in marine sequences absent from Montana

📚 Montana's Actual Eocene Paleontological Heritage

Montana's Eocene fossil record reflects continental and lacustrine paleoenvironments distinct from nummulitic marine limestone. The state's documented Eocene fossils include terrestrial arthropods, mammals, plants, and trace fossils preserved in distinctive sedimentary and volcanic contexts.

• Fossil spiders —

  Oldest fossil spiders recovered from Montana

  include orbweaving spiders from family Aranieidae and ground-dwelling spiders from family Gnaphosidae, preserved as compressions in oil shale

• Mammalian faunas — Pipestone Springs yields middle Chadronian small mammals with

  trace fossils likely constructed by dung beetles

  in helical patterns resembling Rebuffoichnus and Coprinisphaera

• Helena geology —

  Helena sits on many beds of rock

  dating back to the Late Precambrian (ca. 1,400 Ma), with Eocene igneous activity contributing to the region's mineral wealth

Nummulite limestone is restricted to Paleogene and Neogene periods in Saharan and Mediterranean marine settings, making Montana's continental Eocene geology fundamentally incompatible with nummulite fossil occurrence.