THIS EASTERN ORTHODOX CHURCH DOES NOT ACCEPT THE COUNCIL OF CHALCEDON AND ANY COUNCIL OF THE CHURCH AFTER IT

Little old Augusta, Georgia has a Monophysite Eastern Orthodox Church. The logic of their position is exactly the same as the mainline Eastern Orthodox Churches. They don’t like the development or deepening of doctrines. In the case of the Monophysites, who use the same logic as other Johnny-come-lately Eastern Orthodox Churches, their development of doctrine ceased with their rejection of the Council of Chalcedon in 451 AD. They have become ossified in their doctrines since that time, like the majority of Eastern Orthodox have become ossified in their doctrines after the 7th Ecumenical Council:

From AI:

Monophysitism is a Christological doctrine that holds that Jesus Christ has only one nature, a single divine and human nature combined. It is the opposite of dyophysitism, which asserts that Christ has two distinct natures, human and divine. Monophysitism was condemned by the Council of Chalcedon in 451 CE. 

Here's a more detailed explanation:

• Definition:

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  Monophysitism comes from the Greek words "mono" (one) and "physis" (nature). It essentially means the belief that in the incarnation, Jesus' divine and human natures were not separate but merged into a single, unified nature. 
• Key Figures and Doctrine:

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  Eutyches, a priest, was a prominent proponent of monophysitism. He argued that Christ's human nature was absorbed by his divine nature, becoming a single "divine-human" nature. 
Rejection by Orthodox Christianity:
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The Council of Chalcedon, an ecumenical council of the Catholic Church, officially condemned monophysitism in 451 CE. The council affirmed the Chalcedonian Creed,which states that Jesus has two natures, divine and human, united in one person without confusion or division. 
Continuing Beliefs:
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While condemned by mainstream Christianity, some groups and churches maintain monophysite beliefs. These groups are often referred to as "Eastern Orthodox" or "Oriental Orthodox" churches. 
Distinction from Dyophysitism:
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Dyophysitism, the prevailing orthodox view, holds that Christ has two distinct, yet unified natures, divine and human. Monophysitism, by contrast, argues for a single, fused nature. 
Impact on Christian Theology:
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The debate surrounding monophysitism played a crucial role in the development of Christian theology, particularly in understanding the nature of Christ's incarnation and his relationship to the divine and human realms.